Convention ruling that hijacking occurs when a person on board an aircraft has unlawfully committed, or is about to commit, by force or threat, an act of interference, seizure or other wrongful exercise of control of an aircraft in flight. The Convention required every ratifying state to introduce domestic legislation to acquire jurisdiction over the offence. The state that apprehends the offender may either extradite him or her or refer the case to its own prosecuting authority. See HIJACKING ACT 1971.