American paused their mileage expiration in March due to COVID-19. Starting tomorrow, miles will begin expiring again after 18 months of inactivity. That means if you last earned or burned an AA mile in late 2018, you’ll want to earn or burn one today or they’ll be gone tomorrow!
American has free redeposit fees for awards booked today, so if your miles are expiring, just booking an award will extend your miles. You can cancel the award at any time for free.
Also of note, American announced today that they will stop expiring miles of minors. Their mileage expiration clock will now begin when they turn 21, so their miles won’t expire until they turn 22.5, at the earliest. If your minor had their miles expire earlier this year, you can call American to have their miles reactivated for free.