A man was sentenced to 12 years in prison for threatening to set off a fake bomb on a Malaysia Airlines flight.
Last May, a drug-affected Marks ran down the aisle holding a portable speaker and a power bank with flashing lights.
He announced he intended to destroy the plane from outside the cockpit door.
Passengers were able to restrain him with cable ties as the flight flew to an emergency landing.
Marks plead guilty in a Melbourne court to attempting to take control of an aircraft.