All this discussion about getting into the cockpit/ rogue pilot / 2 inside at any one time etc is fair given the current situation.
That said I have been banging away ( no pun intended) for about 5 years on the following "elephant in the room" whereby on several jet liners, those with hostile intentions do not need to even get into the flight deck to achieve their aims.
Whilst the recent events raise several issues, I cannot help think that the one here presents even more concern given the state of global politics. And now we seem to have another one starting in Yemen with ME coalition partners.
And I repeat, this is a Rumsfeld ' known unknown'. It has been elevated to those in power / authority capable of changing it - with no result as yet. Make your own mind up if it's mere sensationalism or a potential threat, yet to materialise.
http://youtu.be/mLmzvF2qkDY