[darkarmani]

> The door while having an impact doesn’t really change much.

What do you mean? Without access to the controls of the plane, they hijackers cannot accomplish their goal of using the plane as a big bomb. They are deterred because it costs a large amount of operational resources to only fail the mission. If they wanted to simply kill people, they have simpler means (much cheaper means) to hit soft targets.

Not only that, the complex, involved missions involve more people which raises the risk of failure, of being caught ahead of time, and of unwinding the clues up the stack. If they are going to take those risks, they want a certain chance of success * size of outcome.

[verelo]

I said this below, but just to throw it here anyway: while that's been true up until now, i'm expecting that to change. Using the plane as a bomb has historically required cockpit access, i expect in the future we'll see a similar attack without cockpit access...just because people will get creative and find a way, if they really want it.