A hijacking prevention system which employs a gas which can render everyone in
the passenger compartment temporarily unconscious in the event a hijacking occurs.
A single switch, hidden in the cockpit and easily accessible to the pilot while
flying the plane, would activate the flow of the gas through the existing venting
system, while simultaneously locking and/or sealing the cockpit door, and deploying
air masks connected to a separate source of fresh air for the pilots. Each of the
crew members, and a selected one of the passengers, e.g., an air Marshall or security
agent, would be equipped with a transmitter alerting the pilots to the need of
deploying the system.
