I have J award ticket DXB-DOH-YUL booked using AA miles and would like to add a segment to the end of the itinerary YUL-PHL. On this route AA only flies economy. Can I still add the last segment in Y to existing business award ticket assuming that sAAver available? Would this trigger reissuing a QR ticket and repricing the award? Would I be risking loosing already ticketed award space on QR if it requires releasing and subsequent new booking?