Personally, I like flying AA. No free upgrades in the US unless you're flying on the higher coach fares, but they do give you some free upgrades (4 500 "stickers" for each 10,000 miles you fly).

And, unlike airlines like Continental, if you don't get an upgrade, coach still has enough leg room for you to get comfortable.

Another good benefit of AA is the ability to upgrade using miles on almost all published fares internationally, including the really cheap ones like net savers.

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