Sign up for our daily newsletterEmail addressSign upI would like to subscribe to The Points Guy newsletters and special email promotions. The Points Guy will not share or sell your email. See privacy policy.American Airlines, who just announced an amazing double elite miles promotion, also announced a new promo to buy back expired miles through December 31, 2011. Normally AA allows you to buy back miles at $50 for every 5,000 miles (subject to 7.5% Federal excise tax), plus a $30 processing charge per transaction, per account.With their current promotion:Contact AAdvantage Customer Service at 1-800-882-8880 (ask for “AAdvantage Account” at the Main Menu)Reactivate rates are as follows, plus 7.5% federal excise tax$200 - to reactivate 1 - 50,000 expired miles$400- to reactivate 50,001 - 75,000 expired miles$600 - to reactivate more than 75,000 expired milesIf you know someone who has lost a ton of miles, this could be a cheaper way to get them back. However, if you’ve loss less than 20,000 miles I wouldn’t recommend buying the miles back unless you know you can use them for more than 1 cent a piece towards future redemptions.Hat tip TPG reader Miriam![card card-name=‘Citi® / AAdvantage® Platinum Select® MasterCard®’ card-id=‘22144516’ type=‘javascript’ bullet-id=‘1’]