Definition of 1A3ai International Aviation Source Category
Emissions which relate to fuel use for international civil aviation. Note that these emissions are to be excluded as far as possible from national totals but should be reported separately. (In other inventory methodologies, landing and take-off (LTO) cycle emissions are often considered as domestic emissions. For the purpose of greenhouse gas emissions inventories, fuel used during landing and take-off for an international flight stage is considered to be part of International Bunkers fuel use.)
United Nations Framework Convention on Climate Change (UNFCCC), Updated UNFCCC reporting guidelines on annual inventories following incorporation of the provisions of decision 14/CP.11. 2006.
Available online at: http://unfccc.int/resource/docs/2006/sbsta/eng/09.pdf
Revised 1996 IPCC Guidelines for National Greenhouse Gas Inventories: Reporting Instructions. Section 1.1, "Source/sink categories."
Available online at: http://www.ipcc-nggip.iges.or.jp/public/gl/guidelin/ch1ri.pdf