Definition: Freight tonne-kilometres performed by on-flight origin/ destination airports
A metric tonne of freight revenue load carried one kilometre. Tonne-kilometres performed is obtained by multiplying the total number of tonnes of freight revenue load carried between two airports as initial origin and final destination by airport-to-airport distance.
The weight of a container should always be considered as revenue freight when travelling on a commercial air waybill.
Draft Glossary on Air Transport Statistics, 2001