Originally Posted by Evan!
This is a suggestion and not a rule. I just completed a flight this month and the F cabin lavatory was not working so we all used the one in Y.
In that case, yes. But FA's can and do make a big deal about it. Remember, one MUST follow a flight crewmembers instructions by law. However, the main thing here is that whatever the OP was asking is never going to happen. Sure, one might get a Spanish/French/German/etc speaker in an exit row by mistake, or some 14 year old girl who is dressed up to look 25, but it is the gate agents responsibility to check these things and the FAs to make sure that the person assigned the seat is eligable and sitting in the correct seat. According to my AA FA mother, AA is going to be disallowing PAX to move from their assigned seats to an "open" seat on a flight. This has usually been overlooked by many FAs and airlines, but AA is going to get strict about it. I think that is great and makes perfect sense. A la why WN sucks (but I guess they are now testing assigned seating)...