Method and device for allocating sustainable aviation fuel to a plurality of flights

Abstract

Method and device for allocating sustainable aviation fuel to a plurality of flights. The present invention relates to a method (50) for allocating sustainable aviation fuel to a plurality of flights, comprising the following steps: - collection (52) of flight data acquiring, for each flight, at least one pair of data formed by information representative of the departure airport and information representative of the arrival airport; - from said collected data and a predetermined climate metric, obtaining (54) an estimated score representative of the estimated climate impact of each flight covering both CO2 emissions and non-CO2 effects; - from all the estimated scores, determining (62) the allocation of sustainable aviation fuel, associated with the maximum reduction of the estimated climate impact of all the flights of said plurality, and allocating to each flight an elementary quantity of sustainable aviation fuel.Figure for the abbreviation: Figure 2.

Description

Title of the invention: Method and device for allocating sustainable aviation fuel to a plurality of flights

[0001] The present invention relates to a method of sustainably allocating aviation fuel to a plurality of flights.

[0002] The invention also relates to a computer program comprising software instructions which, when executed by a computer, implement such a process.

[0003] The present invention also relates to an electronic device for the sustainable allocation of aviation fuel to a plurality of flights.

[0004] The invention is in the field of aeronautics, and more specifically in the optimization of air operations for the purpose of reducing the associated environmental footprint, global warming being a current issue.

[0005] Until now, the aeronautics sector has attached a great deal of importance to CO2 carbon dioxide emissions, but recent studies have shown that CO2 is not the only consequence of air operations since non-CO2 effects represent more than half of the radiative forcing of the sector, a figure of 66% being indicated in particular in the article by Lee et al. entitled "The contribution of global aviation to anthropogenic climate forcing for 2000 to 2018" with uncertainties of the order of + / - 50 mW / m2.

[0006] Indeed, emissions from fuel combustion can be classified into two categories: firstly, primary jet fuel combustion products such as carbon dioxide (CO2), water (HfD), and sulfur oxides (SOx, SO2, SO3), which are the direct result of combustion and therefore have a constant emission index. This means that the quantity of gas emitted is proportional to the quantity of fuel consumed (this proportionality factor being constant).

[0007] The second category, on the other hand, corresponds to secondary jet fuel combustion products such as nitrogen oxides (NOx, NO2, nitrous oxide, etc.), carbon monoxide (CO), HC (oxidative hydrocarbons), PM (particularly particulate matter), and VOCs (volatile organic compounds), which depend on the nature of the combustion process and the engine load. They therefore have an emission index. which varies during the flight depending on the type of engine, engine operating conditions and atmospheric conditions.

[0008] Non-CO2 emissions are associated with non-CO2 effects of several kinds, such as aerosol-cloud interactions, aerosol-radiation interactions, stratospheric water vapor, the aforementioned nitrogen oxides, emissions associated with contrails and also with nitrogen oxides being the non-CO2 emissions having the most significant radiative forcing.

[0009] The radiative forcing of air transport has been estimated at nearly 6 to 7% of the global anthropogenic radiative forcing when integrating CO2 and non-CO2 effects (2 to 3% when integrating only CO2 effects).

[0010] The aviation industry has already made significant scientific progress in improving the environmental efficiency of flight, particularly in terms of weight reduction, aerodynamics, and propulsion. Despite this, emissions from the aviation sector are increasing due to traffic growth, estimated at over 3.6% per year.

[0011] In order for the aeronautical sector to achieve total neutrality (from the English "true zero aviation"), the reduction of CO2 emissions must be complemented by reductions in non-CO2 effects.

[0012] Sustainable aviation fuel (SAF) is today one of the solutions proposed by the aeronautical industry to address the decarbonization of the sector.

[0013] Sustainable aviation fuels (SAFs) are used as a substitute for conventional kerosene used in aviation, such as Jet Al. The production of sustainable aviation fuel (SAFs) relies on carbon capture, particularly through biomass or cooking oils, for example.

[0014] The combustion of sustainable aviation fuel (SAF) therefore has a CO2 emission reduction effect linked to the CO2 that has already been sequestered. Sustainable aviation fuels (SAFs) thus make it possible to significantly reduce CO2 emissions while also having a strong impact on non-CO2 effects from aviation, such as nitrogen oxides (NOx), and particularly on contrails.

[0015] Indeed, the contrails generated by sustainable aviation fuel (SAF) or mixtures of sustainable aviation fuel and conventional kerosene have different physical properties because they are made up of finer (i.e. smaller) but more numerous particles, and consequently have reduced opacity and also remain in the atmosphere for a shorter time (i.e. reduced lifespan), so that they have a reduced impact in terms of CO2 equivalent.

[0016] Thus, although it is desirable for an aircraft to avoid generating a condensation trail, the generation of a condensation trail using sustainable aviation fuel (SAF) remains less harmful to the climate than if it had been generated by conventional kerosene.

[0017] However, sustainable aviation fuel (SAF) is currently a scarce resource, available only at a few airports and often in extremely limited quantities compared to the growing demand from the industry. Since the quantity of sustainable aviation fuel (SAF) is currently very limited, it is impossible for every aircraft to have SAF at the maximum concentration intended by engine manufacturers, namely up to 50%, without modifications to the engine or combustion system.

[0018] When available at an airport, sustainable aviation fuel (SAF) is currently allocated evenly across the available fleet. For example, it is decided that a quantity of SAF is distributed uniformly among all flights within a defined time period; for example, all flights departing between 8:00 a.m. and 1:00 a.m. on a given day will fly with an amount of SAF equal to 2% of their total fuel.

[0019] As an alternative, SAF sustainable aviation fuel is allocated in an unknown proportion within the tanks, its benefit in terms of CO2 reduction being granted, depending on the quantity purchased, to the purchasing entity of said SAF sustainable aviation fuel, such as the aircraft operator, an airport or any other entity managing several aircraft or sites.

[0020] In other words, no current allocation of SAF appears to be implemented intelligently.

[0021] In view of such scarcity and the effectiveness of sustainable aviation fuel (SAF) in reducing CO2 emissions as well as non-CO2 effects, the aim of the invention is to propose a solution allowing for the optimal allocation of such sustainable aviation fuel.

[0022] To this end, the invention relates to a method for allocating sustainable aviation fuel to a plurality of flights planned over a predetermined time interval, the method being implemented by an electronic device, and comprising at least the following steps implemented prior to the departure of said plurality of flights:

[0023] - flight data collection acquiring, for each flight, at least one pair of data formed by representative information of the departure airport and representative information of the arrival airport of said flight;

[0024] - based on said collected data and a predetermined climate metric, obtaining an estimated score representative of the estimated climate impact of each flight of said plurality of flights, said estimated climate impact covering both the CO2 emissions of said flight and the non-CO2 effects associated with said flight;

[0025] - from the set of estimated scores for each flight of said plurality of flights, determination of the sustainable aviation fuel allocation, associated with the maximum reduction of the estimated climate impact of all flights of said plurality, said allocation allocating to each flight an elementary quantity of sustainable aviation fuel to be used during said flight.

[0026] Thus, the present invention proposes a solution for determining the best possible allocation of sustainable aviation fuel (SAF) to a plurality of flights considered according to the overall climate impact of this allocation, and this by ensuring in particular that the small quantity of sustainable aviation fuel (SAF) currently available is allocated to the flights whose resulting reduction in impact, in terms of CO2 emissions and advantageously non-CO2 effect, is the most advantageous.

[0027] The allocation determined according to the present invention is thus intelligent, because it prioritizes the use of sustainable aviation fuel (SAF) for flights whose climate impact is most likely to be reduced by such use, and dynamic (i.e., able to vary) because it adapts to each plurality of flights considered.

[0028] According to other advantageous aspects of the invention, the method comprises one or more of the following features, taken individually or in all technically possible combinations:

[0029] - the flight data collection acquires, for each flight, in addition to said data pair, at least one element belonging to the group comprising at least:

[0030] - the type of aircraft operating the flight in question;

[0031] - the engine of the aircraft operating the flight in question;

[0032] - the scheduled time and day of departure of said flight in question;

[0033] - the trajectory and / or flight plan planned for said flight;

[0034] - at least one weather forecast data item on the trajectory of the type belonging to the group including at least:

[0035] + a humidity value;

[0036] + a temperature data point;

[0037] + a wind data point;

[0038] - obtaining an estimated score representative of the climate impact of each flight of said plurality of flights includes successively at least:

[0039] - the determination of at least one value belonging to the group comprising at less :

[0040] - the quantity of carbon dioxide resulting from the CO2 emissions of said flight;

[0041] - the quantity of carbon dioxide equivalent associated with at least one trail of persistent condensation of said flight;

[0042] - the distance over which at least one persistent condensation trail of said flight is capable of forming;

[0043] - a function representing the climatic impact over time along the trajectory of said flight of at least one persistent condensation trail likely to form during said flight;

[0044] - the determination of at least one estimated score element belonging to the group including:

[0045] - the ratio of the quantity of carbon dioxide equivalent associated with at least one persistent condensation trail of said flight on the quantity of carbon dioxide resulting from the CO2 emissions of said flight;

[0046] - the ratio of the distance over which at least one persistent condensation trail said flight is likely to take place over the total distance likely to be covered during said flight;

[0047] - an estimated score element obtained from the representative impact function climatic over time along the trajectory of said flight of at least one persistent condensation trail likely to form during said flight using the amplitude and times of peak impacts represented via said function;

[0048] - in the event of determination of at least two estimated score elements, the combination according to a predetermined rule of said at least two estimated score elements to obtain said estimated score;

[0049] - the determination of the sustainable aviation fuel allocation uses a optimization by linear programming with an objective of maximizing the reduction of the climate impact of all flights of said plurality, and respecting at least one predetermined constraint of availability and use of sustainable aviation fuel;

[0050] - said at least one constraint belongs to the group comprising at least one of the three following constraints:

[0051] - the sum of the elementary quantities of sustainable aviation fuel allocated respectively, for each flight of said plurality is less than or equal to the total quantity of sustainable aviation fuel available for said plurality;

[0052] - for each flight in which an elementary quantity of sustainable aviation fuel is allocated, the percentage of said elementary quantity in relation to the total quantity of fuel required for said flight is less than or equal to a predetermined percentage value;

[0053] - the sum of the elementary quantities of sustainable aviation fuel allocated respectively to each flight of a set of flights of said plurality associated with the same departure airport is less than or equal to the total quantity of sustainable aviation fuel available within said departure airport for said set of flights;

[0054] - the method further includes a verification step, after implementation effective of the said plurality of flights, of the effectiveness of the said allocation;

[0055] - said verification step includes the following substeps implemented after the arrival of said plurality of flights:

[0056] - collection of actual flight data acquiring, for each flight, at least data of at least one type belonging to the group comprising at least:

[0057] + radar data of trajectory performed;

[0058] +raw flight data provided by a fast access recorder;

[0059] +meteorological data representative of the meteorological conditions encountered during said flight;

[0060] - from the said actual data collected, the said allocation and the said predetermined climate metric, obtaining an effective score representative of the effective climate impact of each flight of said flight plurality, said effective climate impact covering both CO2 emissions of said flight and non-CO2 effects associated with said flight carried out using sustainable aviation fuel allocated according to said allocation;

[0061] - from the set of effective scores of each flight of said plurality of flight, determination of the effective reduction in climate impact obtained via said allocation;

[0062] - comparison of said effective reduction to said estimated maximum reduction during the said determination of the allocation, and in the presence of a discrepancy, reimbursement of said discrepancy;

[0063] - said predetermined climate metric is suitable for being selected beforehand within a list including at least the following metrics:

[0064] - GWP20;

[0065] - GWP50;

[0066] - GWP100;

[0067] - ATR20;

[0068] - ATR50;

[0069] - ATR100;

[0070] - GTP20 or AGTP20;

[0071] - GTP50 or AGTP50;

[0072] - GTP100 or AGTP100;

[0073] - EF or RF.

[0074] The invention also relates to a computer program comprising software instructions which, when executed by a computer, implement a sustainable aviation fuel allocation method to a plurality of flights as defined above.

[0075] The invention also relates to a durable electronic aviation fuel allocation device for a plurality of flights planned over a predetermined time interval, the electronic device comprising at least:

[0076] - a collection module configured to collect flight data and acquire, for for each flight, at least one pair of data formed by information representing the departure airport and information representing the arrival airport of said flight;

[0077] - a retrieval module configured to obtain, from said collected data and a predetermined climate metric, a score representative of the climate impact of each flight of said flight plurality, said climate impact covering both the CO2 emissions of said flight and the non-CO2 effects associated with said flight;

[0078] - a determination module configured to determine, from the set of scores for each flight of said flight plurality, the allocation of sustainable aviation fuel associated with the maximum reduction of the climate impact of all flights of said plurality, said allocation allocating to each flight an elementary quantity of sustainable aviation fuel to be used during said flight.

[0079] The invention will become clearer upon reading the following description, given solely by way of non-limiting example, and made with reference to the drawings in which:

[0080] [Fig.1] The [Fig.1] is a schematic representation of a sustainable aviation fuel allocation electronic device for a plurality of planned flights over a predetermined time interval, according to the present invention.

[0081] [Fig.2] [Fig.2] is a flowchart of the main steps of a process sustainable aviation fuel allocation to a plurality of planned flights over a predetermined time interval, according to the present invention.

[0082] Fig. 1 illustrates an embodiment of an electronic device 10 for allocating sustainable aviation fuel to a plurality of flights planned over a predetermined time interval, according to the present invention.

[0083] The electronic device 10 includes first of all a collection module 12 configured to collect flight data and acquire, for each flight, at least one pair of data formed by information representative of the departure airport and information representative of the arrival airport of said flight.

[0084] As an optional addition, said collection module 12 is also configured to collect additional data from said data pair, including at least one element belonging to the group comprising at least:

[0085] - the type of aircraft operating the flight in question;

[0086] - the engine of the aircraft operating the flight in question;

[0087] - the scheduled time and day of departure of said flight in question;

[0088] - the trajectory and / or flight plan planned for said flight;

[0089] - at least one meteorological data forecast on the trajectory of the type belonging to the group comprising at least:

[0090] + a humidity value;

[0091] + a temperature data point;

[0092] + a wind data point.

[0093] The electronic device 10 further comprises:

[0094] - a retrieval module 14 configured to obtain, from said data collected and a predetermined climate metric, a score representative of the climate impact of each flight in said plurality of flights, said climate impact covering both the CO2 emissions of said flight and the non-CO2 effects associated with said flight, and

[0095] - a determination module 16 configured to determine, from the set scores of each flight of said flight plurality, the allocation of sustainable aviation fuel associated with the maximum reduction of the climate impact of all flights of said plurality, said allocation allocating to each flight an elementary quantity of sustainable aviation fuel to be used during said flight.

[0096] As an optional complement (represented by dashed lines), the acquisition module 14 includes a first determination tool 18 configured to determine at least one value belonging to the group comprising at least:

[0097] - the quantity of carbon dioxide resulting from the CO2 emissions of said flight;

[0098] - the amount of carbon dioxide equivalent associated with at least one trail of persistent condensation of said flight;

[0099] - the distance over which at least one persistent condensation trail of said flight is capable of forming;

[0100] - a function representing the climatic impact, over time, along the trajectory of said flight, of at least one persistent condensation trail likely to form during said flight.

[0101] According to a particular embodiment, said first determination tool 18 uses at least one of the determination elements belonging to the group of determination elements comprising:

[0102] - a modeling tool for the formation and evolution of contrails condensation and cirrus clouds such as CoCip (from the English Contrail Cirrus Prediction tool):

[0103] - predetermined algorithmic climate change functions such as the aCCF (from the English a Igorithmic Climate Change Function);

[0104] - at least one statistical average of previously historical data memorized.

[0105] Note that, according to said first determination tool 18 according to this particular variant, during the collection step 52 it is necessary to obtain additional meteorological input data.

[0106] For example, if the aforementioned CoCip tool is used, the necessary meteorological input data are listed on page 33 of the document by Teoh et al. entitled “Flight trajectories, aircraft performance and emissions”.

[0107] Different meteorological input data than that required by the CoCip tool are required for the aCCF functions, a list of which is indicated in particular in the sub-part entitled "Download Wx data fom ECMWF" of the document which can be consulted via the following URL: https: / / py.contrails.org / integrations / ACCF.html.

[0108] According to this optional add-on, the acquisition module 14 also includes a second determination tool 20 configured to determine at least one estimated score element belonging to the group comprising:

[0109] - the ratio of the amount of carbon dioxide equivalent associated with at least one persistent condensation trail of said flight on the quantity of carbon dioxide resulting from the CO2 emissions of said flight;

[0110] - the ratio of the distance over which at least one persistent condensation trail said flight is likely to take place over the total distance likely to be covered during said flight;

[0111] - an estimated score element obtained from the representative function of the climatic impact, over time, along the trajectory of said flight, of at least one persistent condensation trail likely to form during said flight using the amplitude and times of peak impacts represented via said function.

[0112] According to this optional supplement, the obtaining module 14 also includes a combination tool 22 configured to, in the event of determination by the tool 20 of at least two estimated score elements, combine said at least two estimated score elements according to a predetermined rule to obtain said estimated score.

[0113] As an optional addition, the predetermined climate metric may be pre-selected from a list comprising at least the following metrics:

[0114] - GWP20 (with GWP20 from the English Global Warning Potential over 20 years);

[0115] - GWP50 (with GWP50 from the English Global Warning Potential over 50 years);

[0116] - GWP100 (with GWP100 from the English Global Warning Potential over 100 years);

[0117] - ATR20 (with ATR20 from the English Average Temperature Response aggregated over 20 years);

[0118] - ATR50 (with ATR20 from the English Average Temperature Response aggregated over 50 years);

[0119] - ATR100 (with ATR100 from the English Average Temperature Response aggregated) over 10 years);

[0120] - AGTP20 or GTP20 (with AGTP20 from the English Absolute Global Temperature Change Potential over 20 years and GTP20 (Global Temperature Change Potential over 20 years);

[0121] - AGTP50 or GTP50 (with AGTP50 from the English Absolute Global Temperature Change Potential over 50 years and GTP50 (from the English Global Temperature Change Potential over 50 years);

[0122] - AGTP100 or GTP100 (with AGTP100 from the English Absolute Global Temperature Change Potential over 100 years and GTP100 (from the English Global Temperature Change Potential over 100 years);

[0123] - EF (from the English Energy Forcing) or RF (from the English Radiative Forcing),

[0124] - or any other known climate metric, as cited and explained in particular by Borella et al. in their article entitled "The importance of an informed choice of CO2-equivalence metrics for contrail avoidance".

[0125] As an optional complement, module 16 for determining the allocation of sustainable aviation fuel is configured to implement an optimization by linear programming, said optimization by linear programming having an objective of maximizing the reduction of the climate impact of all the flights of said plurality, and of respecting at least one predetermined constraint of availability and use of sustainable aviation fuel.

[0126] According to this optional addition, said at least one constraint belongs to the group comprising at least one of the following three constraints:

[0127] - the sum of the elementary quantities of sustainable aviation fuel allocated respectively, for each flight of said plurality is less than or equal to the total quantity of sustainable aviation fuel available for said plurality;

[0128] - for each flight in which an elementary quantity of sustainable aviation fuel is allocated, the percentage of said elementary quantity in relation to the total quantity of fuel required for said flight is less than or equal to a predetermined percentage value;

[0129] - the sum of the elementary quantities of sustainable aviation fuel allocated respectively to each flight of a set of flights of said plurality associated with the same departure airport is less than or equal to the total quantity of sustainable aviation fuel available within said departure airport for said set of flights.

[0130] As an optional addition, as shown in dashed lines in [Fig. 1], the electronic device 10 for allocating sustainable aviation fuel to a plurality of flights planned over a predetermined time interval also includes a module 24 for returning the fuel allocation determined by module 16. Such a module The 24-hour return is configured to return, to at least one flight operator or at least one fuel distribution controller at a departure airport for at least one of the flights in said plurality, or to personnel belonging to an airline or oil company, the basic quantity of sustainable aviation fuel (SAF) allocated to each flight according to said allocation. For example, the predetermined time interval allows the selection of all flights on a given day departing between 8:00 a.m. and 1:00 a.m., or all flights between 2:00 p.m. and 10:00 p.m., etc.

[0131] To this end, said module 24 optionally includes a transmission tool 26 configured to transmit, for example via wireless radio communication, to each flight operator, or to each person in charge of SAF sustainable aviation fueling, the elementary quantity of SAF sustainable aviation fuel allocated to each flight according to said allocation, and / or a display or audible playback tool 28 configured to indicate to each flight operator, or to each person in charge of SAF sustainable aviation fueling, the elementary quantity of SAF sustainable aviation fuel allocated to each flight according to said allocation.

[0132] As an optional complement as illustrated in dotted lines on [Fig.1], the electronic device 10 for allocating sustainable aviation fuel to a plurality of flights planned over a predetermined time interval also includes a verification module 30 configured to verify, after effective implementation of said plurality of flights, the effectiveness of said allocation which was applied during said effective implementation of said plurality of flights.

[0133] According to this optional supplement, the verification module 30 includes, in particular, a data collection tool 32 configured to collect actual flight data by acquiring, for each flight, at least data of at least one type belonging to the group comprising at least:

[0134] + radar data of trajectory performed;

[0135] +raw flight data provided by a quick access recorder;

[0136] +meteorological data representative of the meteorological conditions encountered during said flight.

[0137] According to this optional supplement, the verification module 30 includes, for example, in addition a retrieval tool 34 configured to obtain, from said effective data collected, said allocation and said predetermined climate metric, an effective score representative of the effective climate impact of each flight of said flight plurality, said effective climate impact covering both the CO2 emissions of said flight and the non-CO2 effects associated with said flight carried out using the sustainable aviation fuel allocated according to said allocation.

[0138] According to this optional supplement, the verification module 30 further includes, for example, a determination tool 36 configured to determine, from the set of effective scores of each flight of said flight plurality, the effective reduction of climate impact obtained via said allocation.

[0139] According to this optional supplement, the verification module 30 further includes, for example, a comparison tool 38, configured to compare said effective reduction with said maximum reduction estimated during said allocation determination, and in the presence of a difference, provide said difference, in particular via said optional reporting module 24 previously described.

[0140] In the example of [Fig.1], the electronic device for allocating sustainable aviation fuel to a plurality of planned flights over a predetermined time interval includes an information processing unit 40 formed for example of a memory 42 and a processor 44 associated with the memory 42.

[0141] In the example of [Fig. 1], the data collection module 12, the data acquisition module 14, the determination module 16, and optionally the data return module 24 and the verification module 30, are each implemented as a software program, or a software component, executable by the processor 44. The memory 42 of the electronic device for allocating sustainable aviation fuel to a plurality of flights planned over a predetermined time interval is thus capable of storing data collection software, data acquisition software, determination software, and optionally, data return software and verification software. The processor 44 is then capable of executing each of the following software programs: data collection software, data acquisition software, determination software, and optionally, data return software and verification software.

[0142] Alternatively, as illustrated in the example of [Fig.1], the collection module 12, the obtaining module 14, the determination module 16, as well as, as an optional complement, the restitution module 24 and the verification module 30, are each implemented in the form of software, and the restitution module 24 is not implemented in the form of software but in the form of an electronic module.

[0143] In an alternative not shown, the collection module 12, the acquisition module 14, the determination module 16, and optionally the restitution module 24 and the verification module 30, are each implemented as a programmable logic component, such as an FPGA (Field Programmable Gate Array), or as an integrated circuit, such as an ASIC (Application-Specific Integrated Circuit).

[0144] When the electronic device 10 for allocating sustainable aviation fuel to a plurality of planned flights over a predetermined time interval is implemented in the form of one or more software programs, i.e., in the form of a program A computer program, also called a computer program, is capable of being stored on a computer-readable medium, not shown here. A computer-readable medium is, for example, a medium capable of storing electronic instructions and being connected to a bus of a computer system. Examples of such a medium include optical discs, magneto-optical discs, ROM, RAM, any type of non-volatile memory (e.g., FLASH or NVRAM), or a magnetic card. A computer program, comprising software instructions, is then stored on this readable medium.

[0145] An example of the operation of said sustainable aviation fuel allocation electronic device 10 to a plurality of flights planned over a predetermined time interval is now described in relation to [Fig.2].

[0146] More specifically, according to the embodiment of the present invention illustrated by [Fig.2], the method 50 of allocating sustainable aviation fuel to a plurality of flights planned over a predetermined time interval comprises a first step 52 of collecting flight data C acquiring, for each flight, at least one data pair formed by information representing the departure airport and information representing the arrival airport of said flight, such information corresponds for example to a pair coupling two cities namely the departure city and the arrival city (from the English city pair) such for example the pair “PARIS-NYC” to represent a flight between Paris and New York City.

[0147] As an optional addition, the flight data collection 52 acquires, for each flight, in addition to said data pair, at least one element belonging to the group comprising at least:

[0148] - the type of aircraft operating the flight in question (for example, an Airbus A320 aircraft, a Boeing 737, an Airbus A350, an Embraer 190, etc.);

[0149] - the propulsion system of the aircraft operating the flight in question (for example, an engine CFM56-5B4, LEAP-1B28, GEnx-lB70 / P2, the International Civil Aviation Organization (ICAO) engine database, accessible via the following URL: https: / / www.easa.europa.eu / en / domains / environment / icao-aircraft-engine-emissions-databank, also provides a list of existing engines, and in cases where engine identification is not available, a default engine is used, corresponding for example to the most common engine for the type of aircraft operating the flight in question);

[0150] - the scheduled time and day of departure of said flight in question;

[0151] - the trajectory and / or flight plan planned for said flight, for example in the form of a set of points defined in four dimensions, namely three spatial dimensions according to the coordinates (x,y,z) of a predetermined frame and one temporal dimension indicating the instant t associated with said point of the trajectory;

[0152] - at least one meteorological data forecast on the trajectory (i.e. the trajectory of the city ​​pair) of a type belonging to the group comprising at least:

[0153] + a humidity value;

[0154] + a temperature data point;

[0155] + a wind data point.

[0156] Then, the method 50 according to the present invention includes a step 54 of obtaining, from said collected data and a predetermined climate metric, an estimated score representative of the estimated climate impact of each flight of said plurality of flights, said estimated climate impact covering both the CO2 emissions of said flight and the non-CO2 effects associated with said flight.

[0157] In other words, said obtaining step 54 makes it possible to evaluate, in the form of a score B j, the climate impact of each flight j of said plurality, notably selected via a predetermined time interval, to identify those as being the most suitable to operate with a kerosene-SAF mixture (i.e. a mix) in view of their CO2 and non-CO2 balance 2-

[0158] As an optional addition, the said predetermined climate metric may be pre-selected from a list comprising at least the following metrics:

[0159] - GWP20 (with GWP20 from the English Global Warning Potential over 20 years);

[0160] - GWP50 (with GWP50 from the English Global Warning Potential over 50 years);

[0161] - GWP100 (with GWP100 from the English Global Warning Potential over 100 years);

[0162] - ATR20 (with ATR20 from the English Average Temperature Response aggregated over 20 years);

[0163] - ATR50 (with ATR20 from the English Average Temperature Response aggregated over 50 years);

[0164] - ATR100 (with ATR20 from the English Average Temperature Response aggregated) over 10 years);

[0165] - AGTP20 or GTP20 (with AGTP20 from the English Absolute Global Temperature Change Potential over 20 years and GTP20 (Global Temperature Change Potential over 20 years);

[0166] - AGTP50 or GTP50 (with AGTP50 from the English Absolute Global Temperature Change Potential over 50 years and GTP50 (from the English Global Temperature Change Potential over 50 years);

[0167] - AGTP100 or GTP100 (with AGTP100 from the English Absolute Global Temperature Change Potential over 100 years and GTP100 (from the English Global Temperature Change Potential over 100 years);

[0168] - EF (from the English Energy Forcing) or RF (from the English Radiative Forcing),

[0169]

[0170]

[0171]

[0172]

[0173]

[0174]

[0175]

[0176]

[0177] - or any other known climate metric, such as those cited and explained by Borella et al. in their article entitled "The importance of an informed choice of CO2-equivalence metrics for contrail avoidance". According to an optional variant represented by dotted lines, obtaining 54 an estimated score representative of the climate impact of each flight of said plurality of flights comprises successively at least three sub-steps 56, 58 and 60. In other words, according to this optional variant, for each flight of said plurality, sub-steps 56, 58 and 60 are carried out using the data previously collected during step 52 (flight data, meteorological data, etc.). The first substep 56 is the determination D_V of at least one value belonging to the group comprising at least: - the amount of carbon dioxide resulting from the CO2 emissions of said flight; - the amount of carbon dioxide equivalent associated with at least one persistent contrail of said flight; - the distance over which at least one persistent condensation trail of said flight is likely to form; - a function representing the climatic impact, over time, along the trajectory of said flight, of at least one persistent condensation trail likely to form during said flight. According to one variant, the calculation of CO2 emissions due to fuel is produced using a constant multiplication coefficient such that: EICO2 = iMkgarJkgtiiel set by the Civil Aviation Organization International (ICAO) such that CO- = 3.16*^ / J with Qt f the quantity of fuel burned as used in the 1CAO Environmental Report 2022 and in the VICAO Carbon Emissions Calculator Methodology. In other words, the factor of 3.16 is a factor based on the standard estimate of fuel-to-CO2 conversion. According to a second variant, if the mass of fuel (i.e., fuel oil, kerosene, jet fuel, etc.) consumed during the flight in question is not available, it is still possible to estimate the amount of CO2 emitted, even if the accuracy is likely to be lower, by using aircraft performance models (i.e., aircraft) (OpenAP® (open aircraft performance model accessible via the following URL: https: / / openap.dev / ), a Poll-Schumann PS model as described by Poil et al. in the document entitled: "An estimation method for the fuel oil and other performance characteristics of civil transport aircraft in the cruise. Part 1: fundamental quantifies and governing relations for a general atmosphere", BADA® (Base of Aircraft Data), etc.) combined with the flight path and meteorological data, or by relying on based on historical data such as similar past flights or similar flight averages (based on the same departure and arrival airport and the same type of aircraft and possibly even the same engine type).

[0178] To determine the amount of carbon dioxide equivalent associated with at least one persistent contrail from said flight, a climate model, such as, for example, the Contrail Cirrus Prediction tool (CoCiP), is used to model the formation and evolution of contrails and cirrus clouds. This model takes into account flight data and meteorological conditions; these are referred to as "weather-based models," as opposed to "location-based models," which do not take into account the current weather conditions (as described later).

[0179] Such a CoCiP tool is particularly suited to providing a "CO2eq (contrails)" variable whose value is equal to the CO2 equivalent of the contrails of each flight of the plurality considered according to the chosen climate metric (for example, GWP100 as indicated in the list of climate metrics indicated above), or a "Contrail distance" variable whose value is equal to the distance over which contrails form for each flight of the plurality, or a "Contrail impact over time" function representing the climate impact of the contrails, over time, along the trajectory of at least one persistent contrail likely to form during said flight.

[0180] In particular, for the variable “CO2eq (contrails)”, the CoCiP tool provides a prediction of the energy forcing in Joules, caused by the condensation trails generated by the flight, and it is easy to go from a value in Joules (Energy Forcing) to the different metrics (GWP100 for example) in particular as described in the document accessible via the following link: https: / / apidocs.contrails.org / ef-interpretation.html.

[0181] The use of climate models such as the aforementioned CoCiP modeling tool, as an example, to calculate the impact of non-CO2 effects, and more specifically contrails, requires a large amount of meteorological and flight data. In cases where some of this data is missing, workarounds are available to still assess the climate impact of a flight, notably via:

[0182] - the use of a location-based model, using including predetermined algorithmic climate change functions such as aCCF (from the English "an Igorithmic Climate Change Function") which takes, for each flight of said plurality, as input only the trajectory and the fuel consumed along this trajectory, this model providing results in Kelvin, and using an ATR climate metric (ATR20, ATR50 or ATR100 as listed previously with ATR from the English average temperature res panse) which allows us to characterize what the average of the temperature changes caused by the flight in question will be;

[0183] - historical data such as similar past flights or averages of Similar flights. In this case, and unlike the use of "weather-based models" or "location-based models," similar flights associated with the historical data are defined with a predetermined degree of accuracy. Indeed, given the impact of weather on non-CO2 effects, and particularly on contrails, the aim is to select flights that ideally departed at similar times (morning, evening, etc.) and, if possible, flights that departed during similar seasons. All of this is done across a large set of flights to eliminate outliers.

[0184] The second substep 58 is the determination D_E_S_ES of at least one estimated score element belonging to the group comprising:

[0185] - the ratio of the amount of carbon dioxide equivalent associated with at least one The ratio of the persistent contrail of a flight to the total amount of carbon dioxide from the flight's CO2 emissions, known as the "contrail / CO2 ratio," reflects the relative importance of contrails compared to the flight's direct emissions. This ratio is typically the most commonly used to estimate a flight's non-CO2 impact, but it may lack the detail necessary for decision-making regarding mitigation actions because it does not provide information on the timing or distribution of the contrails.

[0186] - the ratio of the distance over which at least one persistent condensation trail said flight is likely to form over the total distance likely to be covered during said flight, such a ratio, called "Contrail Distance Ratio", allows comparison of the distance of persistent condensation trails to the total distance covered by the flight in question, a high value of this ratio implying that the flight in question generates persistent condensation trails over a large part of its trajectory (in particular over at least half), and given that sustainable aviation fuel SAF is mixed with conventional fuel and potentially in different tanks, if an optimization is carried out with this ratio there will be some assurance that the SAF will have been used to reduce non-CO2 effects;

[0187] - an estimated score element obtained from the representative function of the climatic impact, over time, along the trajectory of said flight, of at least one persistent condensation trail likely to form during said flight using the amplitude and peak times of impacts represented via said function, in particular Referred to via the aforementioned Cocip tool as "Contrail Impact over time," this scoring element is calculated using a temporal scoring function that takes into account the amplitude and timing of impact peaks. This scoring element allows for consideration of the temporal evolution of contrails, particularly for mitigation planned in advance. In the case of a long-haul flight generating significant contrails at the end of its trajectory, the evolution of the weather relative to the time of allocation may lead to a situation where the atmospheric conditions have changed and no contrails are generated. A scoring function that assigns a higher score to contrails occurring at the beginning of the flight and with the greatest amplitude is therefore a suitable option.

[0188] When the score element is an estimated score element obtained from the function representing the climatic impact, over time, along the trajectory of said flight, of at least one persistent condensation trail likely to form during said flight using the amplitude and times of peak impacts represented via said function, suitable to be called in English "Contrail Impact over time score", such a score element is suitable to be represented by the following equation where the value of said score element is normalized to keep values ​​consistent with the other aforementioned score elements "Contrail / CO2 Ratio" and "Contrail Distance Ratio":

[0189] Normalized "Contrail Impact over time score" = pr-~

[0190] with the amplitude of a peak i of said function; h the time when peak i occurs, and negates the number of peaks of said function.

[0191] By way of example, for a clean flight consuming 4.5 tonnes of fuel over a distance of 1200km, whose CO2eq impact due to persistent contrails was estimated at 3 tonnes with the GWP100 metric and which would generate contrails over 100km, all in three peaks at different time horizons, for example at 5% of the flight, 30% of the flight and 80% of the flight and in different amplitudes 70%, 20%, 10% respectively, the score element "Contrail / CO2 Ratio" would have a normalized value of 0.21, the score element "Contrail Distance Ratio" would have a normalized value of 0.1 and the score element "Contrail Impact over time score" would have a value of 0.44.

[0192] The third substep 60 is implemented in the event of determination of at least two estimated score elements, and corresponds to (i.e. is) the combination according to a predetermined rule of said at least two estimated score elements to obtain said estimated score.

[0193] Note that the type of determination implemented during substep 56 renders certain score elements incalculable. Indeed, if the use of the model “ location-based allows the calculation of the three types of score elements "Ratio contrail / CO2", "Ratio contrail distance" and "Contrail Impact over time score", it is not possible to do this using only historical data from similar past flights, so that in the case where we would use the latter then the only calculable score element corresponds to the "Ratio contrail / CO2" (i;e. the ratio between CO2 eq and CO2), and would be the only estimated score element then used for the next step 62 as parameter Bj of the flight j considered in order to proceed with the allocation, as such, as described below.

[0194] According to another unshown embodiment, steps 56, 58, 60 are carried out outside the sustainable aviation fuel allocation electronic device for a plurality of planned flights over a predetermined time interval, according to the present invention (i.e. by an entity external to said device), and in this case the sustainable aviation fuel allocation electronic device directly obtains an externally calculated estimated score.

[0195] Then, the method 50 according to the present invention includes a step 62, implemented from the set of estimated scores of each flight of said plurality of flights, to determine the allocation A of sustainable aviation fuel, associated with the maximum reduction of the estimated climate impact of all the flights of said plurality, said allocation allocating to each flight an elementary quantity of sustainable aviation fuel to be used during said flight.

[0196] As an optional complement, the determination of the allocation of sustainable aviation fuel uses a linear programming optimization with an objective of maximizing the reduction of the climate impact of all flights of said plurality, and of respecting at least one predetermined constraint of availability and use of sustainable aviation fuel.

[0197] In other words, step 62 aims to propose an allocation of SAF that optimizes the reducing the overall climate impact of flights, taking into account various criteria climatic and logistical constraints.

[0198] This problem is modeled as a linear programming problem, with the objective of maximizing the reduction of climate impact while respecting the imposed constraint(s), and is suitable for being formalized in maximizing with xj the amount of SAF allocated to each flight j this amount which can be zero (i.e., for some flights there is no allocated SAF), Bj the score associated with each flight at the end of sub-step 60, representing the potential for climate impact reduction for each flight j, considering that the closer Bj is to 1, the greater the potential for climate impact reduction when allocated SAF sustainable aviation fuel (note that in some cases, this score may be greater than 1 if the effects due to persistent contrails are greater than CO2 emissions.

[0199] According to this optional supplement, said at least one constraint belongs to the group comprising at least the following three constraints:

[0200] - the sum of the elementary quantities of sustainable aviation fuel allocated respectively for each flight of said plurality is less than or equal to the total quantity of sustainable aviation fuel available for said plurality, as illustrated by the following equation: < ;y, with N the total quantity of SAF available for the allowance;

[0201] - for each flight in which an elementary quantity of sustainable aviation fuel is allocated, the percentage of said elementary quantity relative to the total quantity of fuel required for said flight is less than or equal to a predetermined percentage value, as illustrated by the following equation: yi jiri- with M the percentage of SAF that a flight can have at most (today this value is 50%);

[0202] - the sum of the elementary quantities of sustainable aviation fuel allocated respectively to each flight of a set of flights of said plurality associated with the same departure airport is less than or equal to the total quantity of sustainable aviation fuel available within said departure airport for said set of flights, as illustrated by the following equation: V ki, = 5g=i}, with y representing the presence of SAF at (k,l) respectively representing the pair (flight, airport) and <5 the Kronecker delta..

[0203] To solve such a linear programming problem, various solvers are suitable for use to arrive at an allocation proposal, for example the PuLP solver in Python, or as an alternative CPLEX® (from IBM ILOG), Gurobi in Python, etc., capable of providing for the plurality of flights considered, the quantity of sustainable aviation fuel SAF that must be allocated to maximize the reduction of climate impact.

[0204] It should be noted that this allocation (i.e. mitigation) process could also be associated with flight level mitigation, namely, for example, that an aircraft which has very few constraints imposed by air traffic control ATC (Air Traffic Control) could be less of a priority for an allocation of SAF, a simple and inexpensive means of mitigation then already being available, namely the change of flight level FL (Flight Level?) in this case.

[0205] In summary, in this case, an additional type of constraint would be taken into account, and an aircraft, for a given flight, would benefit from a specific allocation of SAF if: the departure airport has SAF in a measurable quantity, the city pair (i.e. the pair coupling two cities, namely the city of departure and the city of arrival of the flight in question) and the aircraft in question are a source of “big hit” flights, namely a flight whose quantity in terms of CO2 equivalent: CO2eq (due to non-CO2 effects) is significant in relation to CO2 (i.e. CO2eq / CO2 ratio at least equal to one), and if simple and less expensive mitigations of the type “change of flight level FL” are considered useless, impossible or too uncertain.

[0206] Then, optionally, as illustrated in dotted lines according to the embodiment example in [Fig.2], the method 50 according to the present invention includes an optional step 64 of restoring R the fuel allocation determined at the end of step 62.

[0207] Such a rendering being, as previously indicated, carried out via transmission (e.g. wireless radio communication), and / or via display or sound rendering.

[0208] Then, optionally, as illustrated in dotted lines according to the embodiment example in [Fig.2], the method 50 according to the present invention includes an optional step 66 of use U, as such, of said allocation during SAF sustainable aviation fuel refueling of each aircraft associated with each flight of said plurality.

[0209] As an optional addition, the method 50 according to the present invention further includes a step 68 of verification, after effective implementation of said plurality of flights, of the effectiveness of said allocation.

[0210] According to a particular variant of this optional supplement, said verification step 68 includes substeps 70, 72, 74 and 76 implemented after the arrival of said plurality of flights.

[0211] Substep 70 is a C_D_E actual flight data collection step acquiring, for each flight, at least data of at least one type belonging to the group comprising at least:

[0212] + radar data of trajectory performed;

[0213] +raw flight data provided by a quick access recorder;

[0214] +meteorological data representative of the meteorological conditions encountered during said flight.

[0215] Note that the meteorological data required for verification step 68 are of similar types to those required during collection step 52 and are also advantageously suited to be supplemented by meteorological data collected during the flight by aircraft sensors capable of capturing temperature, wind and even humidity data, particularly for aircraft comprising the IAGOS fleet (from the English In-service Aircraft for a Global Observing System).

[0216] Substep 72 is implemented using said collected effective data, said allocation and said predetermined climate metric, and is a step of obtaining O_S_EFF of an effective score representative of the effective climate impact of each flight of said plurality of flights, said effective climate impact covering both the CO2 emissions of said flight and the non-CO2 effects associated with said flight carried out using sustainable aviation fuel allocated according to said allocation.

[0217] Substep 74 is implemented using the set of effective scores of each flight of said flight plurality and is a D_R determination step of the effective climate impact reduction obtained via said allocation.

[0218] Finally, substep 76 is a COMP comparison step of said effective reduction to said maximum reduction estimated during said allocation determination 62, and in the presence of a difference (greater than a predetermined threshold), also includes the restitution of said difference in particular via said optional restitution module 24 previously described.

[0219] In other words, according to verification step 68, once the allocation has been determined at the end of step 62, and the SAF has been concretely allocated to the different aircraft, it is possible to verify a posteriori that the allocation strategy has been beneficial from a climate point of view, for example by reducing the amount of CO2eq emitted after allocation versus the scenario without allocation.

[0220] To this end, according to substep 70, the completed flights are retrieved again, this time using data from a cooperative air traffic control surveillance system (e.g., ADS-B, Automatic Dependent Surveillance-Broadcast) or, if necessary, raw flight data provided by a Quick Access Recorder (QAR). The weather at the time of the completed flight is also retrieved, and emissions calculations are performed to determine the amount of carbon dioxide equivalent (CO2eq) emitted by each flight in the plurality of flights considered for allocation.

[0221] To take into account the quantity of sustainable aviation fuel (SAF) in the calculation of emissions, several known methods can be used, for example using data associated with engines, in particular relating to non-volatile particles (nvPM), the emission index (El), etc., and modeling tools for the formation and evolution of contrails and cirrus such as CoCip (Contrail Cirrus Prediction tool) to calculate the radiative forcing (RF), then the quantity of carbon dioxide equivalent (CO2eq) associated with these flights. A simplified approach based on known coefficients and nomograms as a function of the mixture (i.e. the proportion) of SAF in each flight can also be applied.An interpolation for SAF values ​​not existing in these known methods mentioned above is, where appropriate, also suitable to be implemented during this verification step 68.

[0222] According to this step 68, via substep 76, it is finally proposed to compare all the emissions of the different flights and to carry out a delta versus a credible alternative scenario, such as for example, the scenario corresponding to that recently put forward by the European Union with a new mandate for all European flights to integrate a minimum quantity of SAF of a few percent (from one to two percent).

[0223] Such a comparison 76 a post-mortem therefore makes it possible to compare the allocation proposed according to the present invention to several nominal scenarios and to ensure a reduced impact.

[0224] Such a verification step 68 is also suitable for use in creating SAF consumption / use models in flight in the event that an innovative fuel management system would allow for non-uniform SAF consumption during a flight.

[0225] A person skilled in the art will understand that the invention is not limited to the embodiments described, nor to the particular examples of the description, the embodiments and variants mentioned above being capable of being combined with each other to generate new embodiments of the invention.

[0226] In other words, the invention seeks in particular to estimate and detect flights likely to generate contrails and to propose a realistic allocation of sustainable aviation fuel SAF for these flights according to multiple constraints (airport infrastructure, constraints associated with airlines, SAF not available, impossibility of avoiding contrail generation areas due to ATC traffic conditions, etc.).

[0227] The invention therefore proposes to reduce the climate impact of aviation by relying on a better allocation of SAF based on calculations and estimates from climate, meteorological and aircraft models.

Claims

Demands

1. A method (50) for allocating sustainable aviation fuel to a plurality of flights planned over a predetermined time interval, the method being implemented by an electronic device, and comprising at least the following steps implemented prior to the departure of said plurality of flights: - collecting (52) flight data acquiring, for each flight, at least one pair of data formed by information representative of the departure airport and information representative of the arrival airport of said flight; - from said collected data and a predetermined climate metric, obtaining (54) an estimated score representative of the estimated climate impact of each flight in said plurality of flights, said estimated climate impact covering both the CO2 emissions of said flight and the non-CO2 effects associated with said flight;- from the set of estimated scores of each flight of said plurality of flights, determination (62) of the allocation of sustainable aviation fuel, associated with the maximum reduction of the estimated climate impact of all the flights of said plurality, said allocation allocating to each flight an elementary quantity of sustainable aviation fuel to be used during said flight.;

2. A method (50) according to claim 1, wherein the flight data collection (52) acquires, for each flight, in addition to said data pair, at least one element belonging to the group comprising at least: - the type of aircraft operating the flight in question; - the engine of the aircraft operating the flight in question; - the planned time and day of departure of said flight in question; - the planned trajectory and / or flight plan for said flight; - at least one planned weather data on the trajectory of the type belonging to the group comprising at least: + a humidity data point; + a temperature data point; + a wind data point.

3. A method according to claim 1 or 2, wherein obtaining (54) an estimated score representative of the climate impact of each flight of said flight plurality successively comprises at least: - the determination (56) of at least one value belonging to the group comprising at least: - the quantity of carbon dioxide from CO2 emissions of said flight; - the quantity of carbon dioxide equivalent associated with at least one persistent contrail of said flight; - the distance over which at least one persistent contrail of said flight is likely to form; - a function representing the climatic impact over time along the trajectory of said flight of at least one persistent contrail likely to form during said flight; - the determination (58) of at least one estimated score element belonging to the group comprising: - the ratio of the quantity of carbon dioxide equivalent associated with at least one persistent contrail of said flight to the quantity of carbon dioxide from CO2 emissions of said flight;- the ratio of the distance over which at least one persistent condensation trail of said flight is likely to form to the total distance likely to be covered during said flight; - an estimated score element obtained from the function representing the climatic impact over time along the trajectory of said flight of at least one persistent condensation trail likely to form during said flight using the amplitude and times of peak impacts represented via said function; - in the event of the determination of at least two estimated score elements, the combination (60) according to a predetermined rule of said at least two estimated score elements to obtain said estimated score.

4. A method (50) according to any one of the preceding claims, wherein the determination (62) of the sustainable aviation fuel allocation uses a linear programming optimization having an objective of maximizing the reduction of the climate impact of all flights of said plurality, and of respecting at least one predetermined constraint of availability and use of sustainable aviation fuel.

5. Method (50) according to claim 4, wherein said at least one constraint belongs to the group comprising at least one of the following three constraints: - the sum of the elementary quantities of sustainable aviation fuel allocated respectively to each flight of said plurality is less than or equal to the total quantity of sustainable aviation fuel available for said plurality; - for each flight to which an elementary quantity of sustainable aviation fuel is allocated, the percentage of said elementary quantity relative to the total quantity of fuel required for said flight is less than or equal to a predetermined percentage value; - the sum of the elementary quantities of sustainable aviation fuel allocated respectively to each flight of a set of flights of said plurality associated with the same departure airport is less than or equal to the total quantity of sustainable aviation fuel available within said departure airport for said set of flights.

6. Method (50) according to any one of the preceding claims further comprising a verification step (68), after effective implementation of said plurality of flights, of the effectiveness of said allocation.

7. A method (50) according to claim 6, wherein said verification step (68) comprises the following substeps implemented after the arrival of said plurality of flights: - collection of actual flight data acquiring, for each flight, at least data of at least one type belonging to the group comprising at least: + radar data of trajectory taken; +raw flight data provided by a quick access recorder; +meteorological data representative of the weather conditions encountered during said flight; - from said effective data collected, said allocation and said predetermined climate metric, obtaining an effective score representative of the effective climate impact of each flight of said plurality of flights, said effective climate impact covering both the CO2 emissions of said flight and the non-CO2 effects associated with said flight carried out using sustainable aviation fuel allocated according to said allocation; - from the set of effective scores of each flight of said plurality of flights, determination of the effective reduction of climate impact obtained via said allocation; - comparison of said effective reduction to said maximum reduction estimated during said determination of the allocation, and in the presence of a difference, restitution of said difference.

8. A method (50) according to any one of the preceding claims, wherein said predetermined climate metric is suitable for being pre-selected from a list comprising at least the following metrics: - GWP20; - GWP50; - GWP100; - ATR20; - ATR50; - ATR100; - GTP20 or AGTP20; - GTP50 or AGTP50; - GTP100 or AGTP100; - EF or RF.

9. A computer program comprising software instructions which, when executed by a computer, implement a method for allocating sustainable aviation fuel to a plurality of scheduled flights over a predetermined time interval according to any one of the preceding claims.

10. Electronic device (10) for allocating sustainable aviation fuel to a plurality of flights planned over a predetermined time interval, the electronic device being characterized in that it comprises at least: - a collection module (12) configured to collect flight data and acquire, for each flight, at least one pair of data formed by information representative of the departure airport and information representative of the arrival airport of said flight; - a retrieval module (14) configured to obtain, from said collected data and a predetermined climate metric, a score representative of the climate impact of each flight of said plurality of flights, said climate impact covering both the CO2 emissions of said flight and the non-CO2 effects associated with said flight; - a determination module (16) configured to determine, from the set of scores of each flight of said flight plurality, the allocation of sustainable aviation fuel associated with the maximum reduction of the climate impact of all flights of said plurality, said allocation allocating to each flight an elementary quantity of sustainable aviation fuel to be used during said flight.

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