Hijack: v. to willfully and nonfraudulently steal a motorized vehicle and/or airplane with a human(s) on board
If you use force or the threat of force to steal an airplane or other motorized vehicle then you are hijacking it if there is a human(s) in it.
Hijacking of airplanes is getting very rare because of strict security measures but truck hijacking is still a problem in some cases where the payload is very expensive.
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