Originally Posted by agjil

I got YYZ-YUL-YVR coming up, and I'm flying with a friend of mine.
We are on separate reservations, so the only way I can upgrade my buddy would be by requesting his upgrade at the airport.
In this case, where do I request his upgrade for the YUL-YVR flight?
It is done at YYZ when we check in, or do I need to talk to an agent in YUL?
The connection in YUL is a same-day connection.