Originally Posted by
rustykettel
Are you within T-48 of departure of the new flight? If so, just the GA add you to the upgrade list and you should clear immediately if U is open (which is needed for a GGU upgrade as well). I've never used a GGU on a rebooking, but they do seem to be coded slightly differently behind the scenes as they post as original fare earnings not full Y CoS bonus.
Nope, the flight's pretty far out. It was a bump due to a schedule change. If it's retaining the original CoS, I might be out of luck. I'll call and ask the agent though.