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• How do I keep my miles from expiring?

It’s very easy to prevent AAdvantage miles from expiring! You don’t need to fly – simply have any activity (earning or redemption) in your account at least every 18 months. There are many ways to do this, including carrying and using an AAdvantage credit or debit card, dining at a participating restaurant in the AA Rewards Network, or buying something online through AAdvantage eShopping.

Wiki: Earning Non-Air Mileage
AA.com: Mileage Expiration Policy | Partners and Mileage Programs
FT: Best ways to prevent miles from expiring (consolidated)
FT: How to prevent miles expiring -- without thinking about it
FT: Preventing mileage expiration for Canadian AAdvantage members
FT: Preventing mileage expiration for UK and other non-US AAdvantage members