I'm upgraded this evening DFW-PHX, msgleff is not yet, she's likely next on the list. But the flight is F0. She's got an aisle seat exit row. I would like to trade my F (aisle) seat for the middle seat exit row next to her, which I had had before I was upgrading, but which is now occupied by someone else. That is, as seems 98% likely, she doesn't clear into F. Proper etiquette in this? How would you do it? - Wait in the exit row seat until the occupant shows up, then hand them your boarding pass to go take your seat in F? - Ask an F flight attendant if it's ok? - Arrange it some other way? Etiquette advice appreciated, and in case it matters I'm flying AA..