Definition: Revenue tonne-kilometres performed
A metric tonne of revenue load carried one kilometre. Tonne-kilometres performed equals the sum of the products obtained by multiplying the total number of tonnes of each category of revenue load carried on each sector of a flight 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