Originally Posted by
flying_owl
There's always going to be the guy who doesn't get an aisle seat because OP booked one, and even when OP moves someone who booked later (presumably) will take that aisle seat. You could say that there's no net gain or loss for passengers as a whole, but there will be one lucky and one unlucky passenger.
True but there would have been one lucky and one unlucky anyway. All the A/C booking does is change who is lucky and who is unlucky.