Originally Posted by Ted Striker
You will see this frequently because FAs are at or near the bottom of the standby list and frequently the last seats to open up are premium seats previously taken by elites (who are then upgraded).
However I don't know of any airline that allows positive space crew members to prereserve premium seats.
It's possible. I flew positive space on a couple of carriers (priority slightly higher than crew) and had open reign on coach seating.
But I think the first explanation is the most likely here. Was on an EWR-IAH jam packed and an elite flyer got angry that an FA insisted on her window seat when he was stuck in the middle.