In my honest opinion, the AA AAdvantage program has to be the worst frequent flyer programs of the major airlines. I don't believe other USA airlines give 1/2 points for booking the lowest classes on a Y ticket. Earning miles on CX, JL, and BA USA-Europe flights are difficult or your miles are reduced unless you pay a lot for the ticket (The latter of course is impossible no exceptions until probably October this year). AA became the first airline to charge non-elite AAdvantage members a copay for flights within the continental USA and Canada.
What do you believe has the worst airline flyer program and why?