FEIS stands for aviation fuel use and emission inventory system.
FEIS uses EUROCONTROL's Advanced Emission Model (AEM) to process 4D flight trajectory data, flight segment by flight segment, and estimates the fuel consumption and the masses of a long list of emissions produced in each segment. These are then aggregated to give the fuel burn and emissions per flight. The analysis is carried out for all flight data collected by EUROCONTROL.
FEIS covers all 44 member countries of the European Civil Aviation Conference (ECAC) since 2005. It assists these states in the verification of their national aviation emission inventory data, and can also be used as the primary source for their reporting to the United Nations Framework Convention on Climate Change (UNFCCC) and the UNECE Convention on Long-range Transboundary Air Pollution (CLRTAP).
FEIS is updated every year.