Originally Posted by arf04

Anything is possible, so don’t lose hope. They will let you know at around 72 hours from departure at the latest. If you don’t get the upgrade, it may be offered at online check in so it’s worth doing that at the earliest moment you can (e.g., right at the 24 hour mark). If nothing is offered, ask the check in agents if there is availability, and if that doesn’t work ask at the gate. Sometimes, people do not show up for their flights so once check in closes those seats may be offered for a paid upgrade.

If you haven’t flown Westjet’s premium economy on the 787 it’s really very nice so isn’t a bad consolation prize if that’s where you end up.