A view of Howard Hughes' Flying Boat being prepared for a test run in San Pedro, California.

A view of Howard Hughes' Flying Boat being prepared for a test run in San Pedro, California.

A view of Howard Hughes' Flying Boat being prepared for a test run in Long Beach, California.

A view of Howard Hughes' Flying Boat being prepared for a test run in Long Beach, California.

Description given with photo: "Hughes Pilots Radar-Equipped Plane Culver City, Calif. -- First passenger plane equipped with radar is flown in demonstration May 1st by Howard Hughes (left) and co-pilot R.C. Loomis over Culver City. Pilots using this equipment will be warned of approaching obstacles by lights flashing on radar panel. Two lights (lefts) with 2,000-foot range, are used to guarantee clearance over mountains; two lights (right) with 500-foot range, are a safety device for approaches and landings. Either set of lights warns against approaching aircraft. Trans-World Airline plans to install radar on its passenger planes. Credit (ACME) 5-3-47."

Description given with photograph: "Hughes' streamlined Stratoliner groomed for record dash. Glendale, Calif.-- With customary secrecy, Howard Hughes, millionaire oilman and speed-flier, is reported to be grooming his new $250,000, four-motored, streamlined Stratoliner(above) for another record-breaking transcontinental flight from Glendale, Calif., to New York. Hughes made the headlines some time ago when he broke the transcontinental record in a smaller ship. The new craft is pictured just before a trial flight at Glendale."

Description given with photo: "Howard Hughes Flying Boat at anchor, Terminal Island. (battleships in background) Long Beach, Cal."