NancyLebovitz comments on What you know that ain't so - Less Wrong Discussion
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That's hard to say. There might be a lot of precautions which are plausible and individually cheap, but all of them together are expensive. Some of the precautions might even be incompatible with each other.
I think that you'd need to have ways to know in advance which precautions are most important.
This being said, I really wish US airlines had reinforced cockpit doors before 9/11.
Wouldn't have helped. Before 9/11 the standard operating procedure -- that is, officially approved strategy taught to pilots -- was to cooperate with the hijackers, get the plane on the ground, negotiate from there.