Originally Posted by golfingboy

It can vary slightly, by a few spots, since the CPU list uses time of ticketing as the tie breaker while the airport list uses time of check in. So if there are 4 1Ks on W fare where A bought first and D bought last. But D checks in first followed by C, A, B... Then the airport list will show D C A B. however, the system uses the CPU list until one hour before departure.

So if the upgrade runs at 4 hours out clearing two customers for two remaining F seats then A and B will jump over C and D even though C and D is showing up as #1 and 2 on the list. But, if the upgrade does not run until the gate agent runs the upgrade 30 minutes before the flight then D and C will get the upgrade.

But aside from the tie breaker, priority is exactly the same.