Americanís Old Non-Expiring Miles Will Now be Subject to Expiration
American Airlines announced this week a change to all AAdvantage miles earned before July 1, 1989, which previously didnít expire. Starting on November 1, 2012, these miles will be converted to miles that will be subject to expiration.
As long as you earn or redeem AAdvantage miles at least once every 18 months, your miles will not expire. On November 1, the original AAdvantage award structure will be discontinued.
AAdvantage Mileage Conversion