Definition: Freight tonnes carried
The number of tonnes of freight carried is obtained by counting each tonne of freight on a particular flight (with one flight number) once only. The same principle should be used in calculating mail tonnes carried.
The weight of a container should always be considered as revenue freight when travelling on a commercial air waybill.
On some flights, the flight number changes at an airport to designate the change between an inbound and outbound flight but with intermediate stops. An example is a flight from Barcelona to Hamburg where the flight continues to Frankfurt before returning to Barcelona. Where freight for an intermediate destination continues its journey on the same aircraft in such circumstances, it should be counted twice because of the change of flight number.
Draft Glossary on Air Transport Statistics, 2001