So here's a new one...(For me anyway) - just got an email confirming my UG YYZ - YVR on Thurs, and a txt that says:

Bill, the wait is over! You've got an upgrade for your trip to Vancouver on flight xxx. You'll now be seated in 35D.

Thought to myself, that must be the biggest J cabin ever!

Concerned there was some mix up, went into the booking on the website and sure enough UG confirmed and was able to select my seat in J.