Step 1: Estimation of the aircraft fuel burn
Step 2: Calculation of the passengers' fuel burn based on a passenger/freight factor which is derived from RTK data
Step 3: Calculation of seats occupied (assumption: all aircraft are entirely configured with economic seats). Seat occupied = Total seats * Load Factor
Step 4: CO2 emissions per passenger = (Passengers' fuel burn * 3.16) / Seat occupied
Note: for flights above 3000 km, CO2 emissions per passenger in premium cabin = 2 x CO2 emissions per passenger in economy