Hi Grover, I initially used my CAA discount for our March Break POP Century reservation and got a 15% discount. The CM checked to see that it was applicable for that time period first. She called it the "Triple A" discount. She did ask me for my card number and even an expirey date, but I know others haven't been asked for their number, so it seems to vary. I was told that I would have to show my card at check-in.