Originally Posted by shuttle_boy
Thanks for the info. Also can the door be opened from the inside of the plane while it is in motion or is there a master lock.
In motion? Yes, I believe the procedure for opening the door at the gate will work while taxiing, and potentially during early climb.
Once above an altitude equal to the pressure inside the plane (8000 ft, iirc), the post above is correct about pressure differential preventing opening.