- City pair – to derive distance and fuel consumption per flight leg
- Number of seats – to derive load factor (needed for per passenger calculation)
- Number of passengers transported – to derive load factor
- Fuel usage – per city pair
- Passenger weight – using 100 kg standard value as per International Civil Aviation Organization + 50 kg per seat
- Freight weight (belly cargo weight) – to allocate fuel usage between passengers and belly cargo
- Travel class – to calculate the CO2 emissions per travel class between Economy and Premium Class. In the case of Premium Class, the emissions are doubled.
- Carbon emission factor – 1 kg of jet fuel translates into 3.157 kg of CO2.
Each airline participating in the IATA carbon offset program uses its own actual fuel consumption data from passenger aircraft journeys to maximise the accuracy of the emissions calculation used to offset an individual passenger’s flight. Hence, much of the information normally required to accurately estimate emissions (e.g. when using modelled data averages and emission factors) are not necessary and do not apply to the IATA carbon calculator methodology. This information includes distance travelled and uplift factors for non-direct routing and delays.
Until the available research on radiative forcing becomes more conclusive, IATA recommends that airlines use a Radiative Forcing Index of 1.0.
For more information visit http://qascarbonneutral.com/carbon-offset-standards/.