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As security expert Bruce Schneier repeatedly pointed out back then, the presence of (for example) glass bottles on the drinks trolley meant that would-be terrorists could trivially avail themselves of an improvised edged weapon that was every bit as deadly as 9/11's box cutters.

According to Schneier, there were exactly *two* meaningful security measures taken in those days: reinforcing cockpit doors, and teaching basic self-defense to flight crews.

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