American has a great deal right now on flights to Mexico. They are offering 25% off any flight to Los Cabos and Puerto Vallarta from the US.
The discount is valid for up to six passengers on any one-way or round-trip flight for travel through November 20th. You must book by 11:59PM (CT) on Tuesday, September 18th.
To take advantage of this promotion, enter in DFSJPVFALL09 at the AA website in the promotion code field when searching for flights. You might first want to check your local city page on Airfarewatchdog or use a flexible date search at Orbitz.com to search for the lowest fares before heading over to AA.com to book through this promotion.