Verified answer

You can try

http://goodtraveloffers.com/

Right now, a 10 percent off code is the best you're going to do -- American doesn't typically release a lot of discount codes, and when they do, they usually don't go any higher than 10 percent off.

That being said, the best way I know of right now is to go to the first website linked below and sign up for the contest that is being run at that site by AA. Right now, anyone who signs up for that contest will get a one-time-use 10 percent off code for travel between now and September 9. If you need a code for later in the year than the beginning of September, the best way I know right now to get one is to go to the second website below and purchase an Entertainment book -- purchase of one of those books entitles the user to a one-time-use $10 off per ticket (up to 6 tickets) code for travel for most of the rest of the year.

American does not typically release promotional codes that are available for use by multiple persons -- they are (like the ones for this source) designed to be one-use codes only. Thus, their codes usually don't show up on the coupon code websites like other airlines (who issue promotional codes or coupons that can be used multiple times by multiple persons).

http://www.airfarecouponcodes.com/ usually has them