I'm a frequent flyer on American, but other airlines can be cheaper. Is it worth it to pay $100 more for the AA flight to earn the miles?

Depends on your views. If $100 isn't much of a hit then it may be worth it. My main goal is to get to platinum level; I like the upgrades and at Platinum its almost a given.

If for just regular miles in the bank, not so much. As long as you fly once a year on an airline, the miles don't expire (for most airlines) Now miles do add up and you can also get gift cards and such with them, not just flights.

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