I recall a hijack on the ground somewhere in the third world where the pilots exited via the cockpit windows before the hijakers got there. The airplane stayed on the ground and I believe the passengers survived, except for perhaps one or two killed by the hijackers.
At the time, the airline publically stated this was their SOP.
It takes considerably more training than the Sept. 11 lot had to fire up the systems and get the airplane off the ground.