Have had a 100% upgrade success rate this year, all on T+ flightpass bookings. Generally YYZ-ORD and YYZ-YUL in both directions (Monday mornings and Thursday evenings, so primetime for upgrades) as well as one YYZ-YVR-YUL last weekend.

Upgrades generally clear in advance, although a few have gone down to the gate (YYZ-YVR on Friday afternoon was a particular example).