loo trips are not allowed.
I've seen no count of the number of 'accidents', or the cost of cleaning up after them. On flights in eiother direction between Washington National and LaGuardia airports, passengers are not allowed out of their seat for the entire flight, the flying time typically being between 45 and 60 minutes depending on traffic and weather. Airlines such as the Delta Shuttle and the USAir Shuttle regularly broadcast announcements in the boarding area about going to the bathroom before boarding the aircraft.