Originally Posted by
Ashok Khanna
Ask them super politely on board.
I have swapped seats with my girlfriend once (you can guess which one she took!) but that was for the entire flight
Originally Posted by
DYKWIA
I don't think that a single change would be frowned upon. But swapping half way through a flight wouldn't be possible (probably!).
They'd be more than happy to facilitate a change before they close the boarding door. Maybe even after the first glass of champagne is out...