Fig. 12.
Two on-line calculators (atmosfair and ICAO) for which no analytical functions exist have been run for a wide range of distances and the provided estimates fitted by linear functions, within adjacent distance intervals. Data from the KLM compensation service web site have been retrieved and fitted the same way. The differences between the atmosfair and the other two methods are explained only in part by the fact that ICAO and KLM do not consider a multiplication factor for non-CO2 effects, while atmosfair considers a multiplication factor of 3 for altitudes larger than 9 km