Many destinations give you a choice of connecting through either AMS on KLM or CDG on AF when you're connecting TATL to some other EU destination. This thread concerns that decision in general, independent of your particular destination, assuming that it is served from both hubs. Some general considerations: schedule--convenient arrival and departure times? price (and fare restrictions) FF miles--does the fare earn 100%, etc.? feasible connecting time connecting time not too long (unless you want to see Amsterdam or Paris) general "style" of the airline, service, attitudes of FAs (personal preference, YMMV) Other issues: AMS is generally an extremely efficient and pleasant airport, CDG unfortunately less so If TATL flights would be KLM versus AF, consider aircraft types, age of planes, seating, AVOD, etc. Also, ---KLM lets one buy economy comfort seats (Y+) from any fare, free to FB elites, discounts for DL elites ---AF has separate PV (Y+) cabin/class on most flights; these fares can be upgraded into Affaires (biz) class using DL SWUs, although they can be more expensive than the KLM Y fare plus buy-up ---SkyTeam upgrades with miles generally require a full fare ticket (check rules and availability before purchase) If flying "business" class on intra-European flights: ---KLM seating can be 3-3 in front of the curtain, generally fairly heavy hot meals ---AF uses 2-2 seating, turning the middle seat into a table/armrest, but the seats themselves and the pitch is the same as coach. Others: please amplify and suggest additional criteria.