The only major legacy airline to make it onto our list, KLM Cityhopper, the airline's regional subsidiary, flies across Europe and to some further destinations using its fleet of E-Jet E2 aircraft.

with 176 aircraft (including 62 for KLM Cityhopper). For the other two groups, their second largest fleets are with their LCC subsidiaries. IAG's fleet has an average age of 12.5 years, while Air ...