Wasn't there a sketch by someone like Hancock or Kenneth Williams tapping on
the flight deck window and asking to let in, whilst complaining it was a bit
cold at 30.000 ft ?!

Almost; Hancock was a test pilot & Williams the mechanic working on the tail
when he took off. Includes memorable lines like "Get your boot of my joystick"
and "What does this do" "Don't touch that!" "bang"