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NFR-Code Name of Category Method AD EF Key Category
1.A.3.a Civil Aviation see sub-category details
consisting of / including source categories
LTO-range: Included in National Totals
1.A.3.a i (i) International Civil Aviation - LTO see sub-category details
1.A.3.a ii (i) Domestic Civil Aviation - LTO see sub-category details
Cruise phase: Not included in National Totals
1.A.3.a i (ii) International Civil Aviation - Cruise see sub-category details
1.A.3.a ii (ii) Domestic Civil Aviation - Cruise see sub-category details

Air transports differ significantly from land and water transports with respect to emissions production. In air transports, fuels are burned under atmospheric conditions that a) differ markedly from those prevailing at ground level and b) can vary widely. The main factors that influence the combustion process in this sector include atmospheric pressure, environmental temperature and humidity – all of which are factors that vary considerably with altitude.

In category 1.A.3.a - Civil Aviation the emissions from both national (domestic) and international civil aviation are reported with separate acquisition of flight phases LTO (Landing/Take-off: 0-3,000 feet) and Cruise (above 3,000 feet) where only emissions from LTO from both national and international flights have to be included in the national totals.

Emissions from military aircraft are not included in this category but are reported under Mobile Combustion.

Country specifics: The use of aviation gasoline is assumed to take place within the LTO-range of domestic flights only (below 3,000 feet). This assumption is a compromise due to a lack of further information and data. Aircraft.PNG Method