Britain's latest airliner goes for test flight.
Full title reads: "ROCHESTER".
A large Short Mayo Composite seaplane rising from water. Various shots of the plane in flight. This is Britain's latest airliner during test flight. This plane is designed to to have a smaller plane ride on top of it - a special flying boat which is to help with its takeoff. Later, planes would separate in the air. The twin flight is yet to be tested. More shots of the plane in the air. Plane descends and lands on water.