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They'll let fellow pilots from a competing airline hitch a ride in one of the vacant seats in the cockpit - "jumpseating," they call it.
I remember I was jumpseating on a four hour flight late at night and after we took off I fell asleep and about two hours into the flight I got up and saw all three crew members sleeping and the aircraft was just as usual on auto pilot just crusing. beleive me it happens. its no was they were on laptops or chatting and not hearing the call from the control centers trying to contact them, its no way.