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Do AAdvantage miles expire?
Yes. American AAdvantage miles expire after 24 months with no earning or redemption activity, and any qualifying activity resets the clock on the full balance. AAdvantage credit-card holders and members under 21 are exempt, so their miles stay alive however long the account sits idle.
GuideDo United miles expire?
No. United MileagePlus miles do not expire; United dropped its 18-month inactivity rule in August 2019 and has not reinstated it. A balance survives an idle account indefinitely. What it does not survive is devaluation — United prices awards dynamically, so miles held for years tend to buy less.
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