Cheap Flights from Portland (PWM) to Tampa (TPA) from

I was happy when the stewardess asked a passenger to move from an upgrade seat ( that the passenger had not paid for) back to the economy seat the passenger had paid for. Even though the passenger argued that it was rediculas that she should be able to move to a better seat because it was empty, the stewardess still made her return to her specified seat. I would have been upset if the passenger was permitted to stay in the upgrade seat b cause myself and the other upgrade seat passengers paid the upgrade fees.