Hijack Prevention
It is an indictment of the Aviation Industry that Pax need to be trained to protect the acft.
We know how to make the acft so secure the hijack becomes too risky to attempt, it just requires some political will & decision making.
* multiple layer security on the ground, and this must include a politically incorrect version of CAPPS ( Computer Assisted Passenger Profiling System ). seeNote.
* a fortified & armed flight deck ( to make it fail safe - NO security system is 100% effective)
It's that simple.
Note: CAPPS was in use well before Sept /11 but not allowed to use racial profiling as an element of the system as this is politically incorrect. Some are of the opinion that a racial profiling system would have resulted in the highjackers being given a more thorough security screening which may have detected the weapons carried on board.