Originally Posted by
ostatekitty
Ah, I was not aware of this. Upgrade list shows allegedly there are 2 C+ left, but if seat map can be trusted, the two allegedly available are first two aisle/middle (10B/10C 738) in C+. If those are blocked every flight then that's what's going on.
Seats available on the displayed upgrade list is the unassigned seat count. It has at best a tangential relationship to availability of an upgrade before the flight is under gate control.