Once you enter the sweepstakes it activates the discount
Term & Conditions for 2,500 miles redemption: Member must register for Award Map promo before redemption occurs. Members will receive 2,500 miles off flight award redemption for AA and partner flights. Miles must be redeemed during Jun 26-Jul 24, 2013 for travel between Sep 4-Nov 20, 2013. Award itinerary must be booked online on aa.com. Each AAdvantage member account is only eligible for one rebate during this promo. Please allow for 6-8 weeks for miles to be posted to your account, after travel occurs. Miles will be credited to the AAdvantage member account from which the redemption occurs.
HT view from the wing