Do tanks have ignition keys?
Didn’t Seinfeld do a bit about whether airliners have ignition keys?
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You don't want to add an unnecessary point of failure to a mission critical piece of hardware. The guy with the keys gets shot you're F'd.
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most heavy equipment doesn't, or rather they have keys but with universal/interchangeable key pattern. by convention the keys are left on site in the ignition
same with airplaines, that one dude who hijacked the airliner in seattle just knew what buttons to press and was off
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They have ignition systems, typically via a start button, sometimes dependent on other switches such as fuel line activators
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