Thought to be Selected Originals from late 1940s material.

United States of America (USA). World's largest airliner takes 186 sailors on flight across America.

Sailors leaving aircraft and queuing up outside. Close up shot of nose of aircraft. A woman and sailor walking towards camera and up steps to enter plane. Queue behind them. Long shot of people seated in the aircraft - 186 seat airliner. Passengers seated. Aircraft takes off. Long shot of passengers seated inside the aircraft. Long shot of aircraft in flight. Close up shot, back view, of navigator in compartment. Wireless operator in front of navigator, pan to engineer at control panels. Several shots of aircraft in flight. Close up shot of aircraft running down runway after landing. Closer shot of aircraft taxiing into dispersal point.

Possibly connected with 48/63 - MD.