Originally Posted by
Lord Spandex Masher
It's never been a requirement at the airlines I've worked for to have an extra crew member in the flight deck if one of us is having a quick widdle.
A number two or longer absence, for whatever reason, does require the extra crew member though.
It is on the aircraft I have flown in recent years where there is no keypad to be able to get back in the flight deck. F/A required in flightdeck when one crewmwmber leaves the flight deck.