At that time, the policy was true for many programs, so it wasn't exclusive to America West. My Dad lost miles in AA - didn't fly much and never accumulated enough for a ticket within a 3 yr window. I got some magazines with United on my husband's account because he would have lost his miles - but then United allowed a 1 yr rollover (2 times I think) and we "saved" my miles and my daughter's miles. Continental have never expired. I don't recall what was the policy with Delta. My only award tickets have been with AA, and we always looked carefully at all accounts to make sure we were using soon to expire miles. This change with the airlines has made such a difference. I wouldn't be collecting the miles I have been collecting if I had to use them within 3 years of earning them - or lose them. There is absolutely no reason for anyone to lose miles now with so many "easy" ways to get activity without flying.
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DtG