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> Locked cabin doors are also good.

These have 150 confirmed kills [1], and another 239 suspected kills [2]. They also weigh a lot, so a lot of excessive fuel is burnt because of them every day. They also sometimes break, causing delayed and cancelled flights.

[1] https://en.wikipedia.org/wiki/Germanwings_Flight_9525 [2] https://en.wikipedia.org/wiki/Malaysia_Airlines_Flight_370

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The problem on 9/11 wasn't the crashing of the plane, people accept risk in transport -- the deadliest means of transport in the US in 2001 was an automobile -- 10 times deadlier than being a passenger on a plane. The problem was the using the plane as a weapon.

car - 4600 billion pax miles, 42,000 deaths, 1 per 100 million miles

plane - 500 billion pax miles, 246 deaths of airline travellers on 9/11, 265 from Queens, about 1 per 1 billion miles

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