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Smuggled tools, some kind of creative solution using onboard materials, a weakness they've discovered, etc.

In order words, its not safe to assume a team of intelligent and motivated hijackers couldn't break into a cockpit given sufficient time. But it is safe to assume that the reinforced cockpit door will slow hijackers enough that passengers have time to stop them.

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Unless over the middle of the ocean, most flights are probably close enough to an emergency diversion landing that "sufficient time" would be unlikely.

Hopefully, yes, but we can't just ignore the tens of thousands of flights flying 2-3-4 hours from the nearest airport every year. Particularly because these are the biggest airplanes with the most passengers.

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