Originally Posted by
D582
If the flight was ticketed by another carrier, even if you reverse your check-in, AC may still have coupon control and the ticketing carrier would need to contact them to release this if that's the case before they could make changes.
It doesn't really matter. Airlines can push/pull coupon control very easily, unless you deal with airlines like AI and BR that prevent it so that they can control rebooking and keep revenue.