Noun
air piracy (uncountable)
Hijacking of an aircraft.
Copycat hijackings Cooper was not the first to attempt air piracy for personal gain. Source: Internet
Schaffner described him as calm, polite, and well-spoken, not at all consistent with the stereotypes (enraged, hardened criminals or "take-me-to-Cuba" political dissidents) popularly associated with air piracy at the time. Source: Internet