Have you used Southwest Airlines?
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Unquestionably the best airline to fly with. Can always change your ticket for just the difference in fares (no fees!), and they always let you check 2 bags free for each ticketed passenger, so I don't ever have to worry about cramming stuff into a carry-on if I don't need it until later. Plus, their staff is always SUPER nice and accommodating. Not really sure why I ever flew with any other airline.