1. people who illegally seize control of a vehicle, especially an aircraft, by force or threat

Examples

• The hijackers demanded the plane be flown to another country.
• Security measures were increased to prevent hijackers from boarding aircraft.
• The hijackers were arrested after the plane landed safely.
• Passengers remained calm despite the presence of hijackers on board.
• Air marshals are trained to deal with potential hijackers.
• The hijackers released the hostages after their demands were met.