Originally Posted by
RB211
You could keep the old booking until you can select seats for the new booking (OLC at the latest) and with the new booking open, cancel the old and then select the now free seats from the old booking. There is risk, in that there is a window of opportunity for others to pick your released seats in the seconds it takes for you to select them, but it is a possible way round it.
This probably will not work. Since this is a web special, the lower fare will have to be booked within the maximum 5-day hold AA allows. And AA will have the FF# for both tickets as they are awards and will not allow the duplicate booking to remain - they have mechanisms to cancel duplicate bookings. (I doubt the second would ever TICKET with the first still intact. Also, the OP may find the second PNR has already been cancelled if it has gone overnight as it is a duplicate booking.)