I find that their IRROPS discount codes work about 2/3rds of the time.

I've had so many of these that when they fail I don't bother pursuing it. I have no more energy for all the shenanigans AC throws at us.

(and yes, RCHHMP will tell me to stop flying AC despite me residing near the flagship hub and requiring to go to destinations that AC services direct non-stop and no other airline can out of YYZ).