Originally Posted by
bocastephen
No it is not the customer's seat to trade - the proper process is to notify an agent, request to be rebooked in coach so the next person on the upgrade list can be moved up.
I've witnessed this very thing onboard and have spoken up about it on the spot and was supported by the FA (who said "no") and my seatmate, also on the upgrade list with me.
Where is this process you reference documented?
I have given my seat to soldiers and once a pregnant (7 or 8 months) business woman. The difference being they were passing me in front, so in your scenario you'd be blissfully ignorant of the transaction. It is my seat weather or not I paid or it was an UG. You should MYOB.