Originally Posted by
djjaguar64
I booked an AC Aeroplan award flying on AC metal but the system refused to accept the A3 number, the reason is that when an award tkt is booked you cannot add another airlines FFN to the booking.
I don't think that's the case because I booked award flights using AE and once was leaving GVA to YUL and the other time YUL to SFO both on AC metal and they did change the number at the airport... but I have to admit that I wasn't using an A3 number at the time; it was TK, but I don't think that should make any difference.