Originally Posted by
trentmidds
I disagree with others that say seats are open for grabs when the door shuts. If people really wanted that seat then they should have picked it when getting their boarding pass or at the gate. If they couldn’t then it should not just be up for grabs. If your airlines blocked it then they blocked for a reason and it should stay that way.
If the airline blocked it that's one thing, but if it was a free seat then surely your rule above should apply to EVERYONE - i.e. if the OP wanted 21B he should have booked it in the first place too.
To me, anyway moving to an empty exit row seat is understandable - they're desirable seats to most. In a standard row, if there is one empty seat then I agree that it would be unusual (and I would be annoyed) for a pax to move there from somewhere else as they're not gaining anything, but it's certainly not my place to do or say anything to prevent it - why shouldn't they?