“How does a passenger calculate his CO2 emissions on a flight?” – the climate protection experts at SWISS in cooperation with Lufthansa and myclimate went about answering this question. They assessed and evaluated more than 58 000 individual flights. The entire fleet of the enterprise was analysed, from the small regional jet all the way to the larger long haul aircraft, in order to calculate the overall kerosene consumption during air travel from gate to gate. The calculations included the varying meteorological conditions (winds) and taxiing on the ground, as well as holding patterns and re-routing in the air. This calculation basis was used to determine the average kerosene consumption per passenger for all the routes in the SWISS and Lufthansa flight schedule. Therefore, an emissions calculator can directly allocate the corresponding average CO2 emissions for the respective flight; after all, there is a linear relation between kerosene consumption and emissions.
Besides CO2, air traffic produces other emissions (especially nitrogen oxides and water vapor) to which an impact on climate is attributed. Science is unclear as to the extent of this impact. However, as long as there is still so much uncertainty about the exact effect these non-CO2 air traffic emissions have on climate, SWISS will not be taking any other emissions besides CO2 into account in its emissions calculator.