Armored cockpit doors with good locks would pretty much end hijacking. We could save all the money that we spend on TSA. which in itself is a pretty disfunctional agency.
A former FAA official told me that the whole security screening process was ridiculous. He said the typical terrorist operation just wants to make a media splash; they'd be perfectly happy blowing up a line of several hundred people waiting to get their shoes checked, and the bad guys wouldn't even have to pass a security checkpoint to do it. Basically we just herded the sheep into the killing pen for them.
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