Originally Posted by Doppy
Given how random it is as to whether the crews enforce this or not, I'm guessing it's not mandated by the FAA.
Thats what I was thinking. If it were a true FAA reg, then it would be nearly universaly enforced since the penalties for non-compliance would be stiff. Eg: I have heard that the penalty for taking off with a pax standing in the aisle is something like $10k per incident.