Originally Posted by iadisgreat

I don't know how it actually works, but I'd say you have more to lose drawing attention to it. Right now, worst case is that at boarding you're given a non-exit row middle seat (and you could try at the gate to pay for a MCE seat if this happens). Best case is that you check in online, board, and no one notices or has the energy to do anything. Four hours is a while, but not enough that I would voluntarily give up a F seat for coach if it isn't required.