Ripped from Gary Steiger’s site:

20,000 American Airlines offer.

• Open and fund a qualifying Citibank regular checking account with a minimum of $1,000 by June 30, 2010.
• Within the first month of opening your account, start making:at least one (1) monthly direct deposit into your checking account; or at least two (2) electronic bill payments each month from your account; or five (5) or more qualifying signature purchase transactions each month using your Citibank debit card and continue doing so for three (3) consecutive months and earn your first 10,000 American Airlines dvantage® bonus miles.
• Continue for the next nine (9) months and earn an additional 10,000 Advantage® bonus miles.
• I leave it to you to carefully read the terms and conditions and fees for both the miles offer and for the account.