A detailed discussion is found here: http://www.flyertalk.com/forum/showthread.php?t=554753

With supplementary discussion here (somewhere in the middle): http://www.flyertalk.com/forum/showthread.php?t=552940

But basically, AA had a promo as part of their 25th Anniversary for AAdvantage whereby members earned 250 bonus miles x # of membership years for renting with Avis, up to 6250. Earning for each booking, until Dec 31. It required a 3-day rental with a Friday keep.

Oh, but for the miles you had to have made the reservation before May 31.

The AWD for the discount, though, should still be valid.