Models and Databases

One of the main tasks of ICAO's Committee on Aviation Environmental Protection (CAEP) is to identify and carry out analyses of the future trends and various options available to limit or reduce the current and future impact of international civil aviation noise and emissions. The aim of these analyses is to assess the technical feasibility, the economic reasonableness, and the environmental benefits, as well as the interdependencies of the options considered. In doing so, CAEP has relied on the use of a variety of computer-based models and databases offered by Member States and international organizations that participate in CAEP.

As the need for a better informed policy-making process grows, CAEP's modelling requirements in terms of coverage (i.e. noise, emissions, costs and benefits, etc.) and accuracy increase. Each model and database has its strengths and weaknesses, and the use of multiple models provided CAEP insight into sensitivities of the results. Going forward, the model evaluation process has established a framework for the future evaluation of new models and updates to the existing tools.


The CAEP models  facilitate the robust analysis of the interrelationships between noise, local air quality, and greenhouse gas emissions. As experience is gained investigating these interdependencies, and as the models mature further, more informed decision making on aviation environmental protection will become possible. To support the analyses for the eleventh meeting of CAEP in February 2019, the following models were used:

Contributing Models

AreaModel NameModel DescriptionSponsoring State or Organization
Fleet Evolution
AATAircraft Assignment Tool EUROCONTROL,
FOMFleet and Operations ModuleUS
Fleet Evolution & Cost-EffectivenessAPMT-EAviation environmental Portfolio Management Tool for EconomicsUS
Cost-EffectivenessFCMFESG Cost Model for nvPMFESG
FASTFuture Civil Aviation Scenario Software ToolUK
IMPACTIntegrated Aircraft Noise and Fuel Burn and Emissions Modelling PlatformEUROCONTROL
GHG, LAQ and NoiseAEDTAviation Environmental Design ToolUS
ANCONAircraft Noise Contour ModelUK
STAPESSysTem for AirPort noise Exposure StudiesEUROCONTROL,
LTO EmissionsMDG Landing and Take-Off cycle (LTO) Consensus ModelCAEP MDG
Life cycle Analysis of aviation fuels
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GTAP-BIOGlobal Trade Analysis Project (Bio-fuels module)US
GLOBIOMGlobal Biosphere Management ModelEU
GREETGreenhouse Gases, Regulated Emissions, And Energy Use in Transportation ModelUS
JRC E3dbGHG calculation for bioenergy and biofuels pathwaysEU



Of key importance is the fact that the input databases are common to all of the contributing models. These databases cover specific input parameters and data sets and are continuously updated in accordance with adopted SARPs and requirements. These databases are supplemented with additional information, as needed to ensure the analyses are as comprehensive as possible. To support the analyses for the eleventh meeting of CAEP in February 2019, the following databases were used:

Contributing Databases

AreaDatabase NameDatabase DescriptionSponsoring State or Organization
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Airports DatabaseAirports Database for Modelling OperationsUS, EUROCONTROL
CODCommon Operations DatabaseUS, EUROCONTROL, BRAZIL
CH Fleet DBCampbell-Hill Fleet DatabaseA4A
Population DB

Population Database based on:

US, Brazil, EASA
LAQ, GHGEEDBICAO Aircraft Engine Emissions DatabankICAO, EASA
NoiseNoiseDBICAO Noise DatabaseICAO, DGAC-France
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ANPAircraft Noise and PerformanceEUROCONTROL
BADABase of Aircraft DataEUROCONTROL
Fleet EvolutionFESG Aircraft Retirement CurvesICAO, ICCAIA
G&R DBGrowth and Replacement DatabaseICAO, ICCAIA



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