Slats11
Unfortunately people quickly adapt to mitigate new security measures.
Hijacking / terrorism used to be about getting a gun (or bomb) onto a plane. So we Increased airport security and made that increasingly difficult.
9/11 was about getting a few people with some flying skills onto the plane. So we fitted toughened doors prevent unauthorised access.
The threat now is the mindset and ideology of the pilot sitting forward of these toughened doors. After MH370 and this latest incident, that threat is going to require some thought.
No that isn't quite correct. Prior to 9/11 it was the SOP to cooperate with hijackers on the assumption that they were not suicidal but seeking monetary or political "income"
That changed forever on 9/11 (even during the event) which is why the concern over nail clippers and secure doors has been misplaced. Under the new protocol the entire plane load of passengers is an "army" that can be activated to aid in overcoming the "invaders" (unless the plane is loaded mostly with invaders).
Having a secure door is a good idea but not one that can't let the crew in. It has neutralized the entire "army" on the plane concept as we seem to be seeing in this incident.
Changing the protocol in and of itself neutralized much of the on board threat (assuming TSA does a reasonable job).