Hijackings refer to the unlawful seizure of a vehicle, typically an aircraft, by individuals or groups. This act often involves taking control of the vehicle while it is in transit, posing a threat to passengers and crew. Hijackers may have various motives, including political demands, ransom, or terrorism. The term is most commonly associated with aircraft hijackings, where perpetrators may force the plane to change its destination or make demands. Security measures at airports and on flights have increased significantly to prevent such incidents, including passenger screening and reinforced cockpit doors.