Register a credit card and your AA account for AAdvanage Dining. Dine at a
participating restaurant. Earn miles and extend your expiring miles.
There are even 1000 bonus miles for new member. But you need to spend $30 within first 30 days and write a
review.
The link was from Google search, no ref http://aa.rewardsnetwork.com/bonus.htm?id=a113&detail=y