Originally Posted by
JohnBurke
... It's rare that there aren't several pilots riding on an airliner; in most all cases there are pilots riding in passenger seats, and often on a spare seat in the cockpit, as we go home or to work, and there are often private or commercially rated pilots on board, too. It would be very rare that both pilots in the cockpit are incapacitated, and there's nobody else on board who could fly the aircraft.