Did you buy the air ticket through the cruise line?
Some cruise line, e.g., Princess EZAir, offers protection to get you onboard if you have bought through therm.
On the other hand, my recent ZRH-YYZ flight on AC was held at ZRH for 2.25 hours waiting for connecting passengers from another delayed flight. So there is a chance that AC may hold the YYZ-YVR flight for you. It all depends who's working at AC that morning.