double incapacitation
There are many passengers with deep aviation knowledge (capability to understand and manage the autopilot ) that should be recognized at once in the loading manifesto by the Purser.
It should and extra safety net having more than a relief pilot on board.
Nowadays if you board a plane and play with your FMGS simulator on the Lap top they approach you like a potential terrorist.
In the case of Helios disaster is because the policy (close door) that all perished in a very easy and simple accident to be solved. If I ever will be in an aircraft that continue to climb after the oxygen mask are deployed I will certainly question hard and ASAP the purser asking her to open immediately that stupid armored door!
Airliner are not only restaurant with wings but machine that many of us can handle quite well.Pilot and not pilots, provided their ability at list to handle the radio and find "that" switch on the control to communicate to anybody in that frequency.
but nowadays in order to save lives we would be probably shoot down by a f16
blue skyes