Stunt pilots for the film Hell's Angels line up before the largest fleet of World War I planes ever assembled for the making of a motion picture. The event took place on the runway of the Oakland Airport, March 15, 1929.

Men working inside the HK-1, Hughes Flying Boat, on Terminal Island in the Los Angeles Harbor.

Aerial view of Hughes HK-1, Flying Boat. The plane was designed and built by Howard Hughes; it it shown near completion at its graving dock at Terminal Island in the Los Angeles Harbor. Transcribed from note on back of photo: "World's largest airplane--After Ground tests here the plane will undergo extensive water-taxi tests."

The hull of the $20,000,000 airplane, also known as the Flying Boat or Spruce Goose, being transferred from Culver City to Terminal Island in the Los Angeles Harbor. The Flying Boat was moved to Terminal Island's graving dock where construction was completed in June of 1947.

Howard Hughes (left, in dark coat) noted designer, builder, and industrialist entering the hull of the Hughes Flying Boat, the largest airplane in the world, as it was nearing completion on Terminal Island in the Los Angeles Harbor. With him is Joe Petralli, assistant director of service and flight.

Howard Hughes (right) and Earl Martyn inside of the HK-1, Hughes Flying Boat, which was near completion on Terminal Island in the Los Angeles Harbor. The Hughes Flying Boat, also called the Spruce Goose, was the largest plane in the world.

Photographs that accompany the attached press release: "HUGHES DEMONSTRATES NEW RADAR WARNING Howard Hughes, at the controls of the TWA Constellation, demonstrates the efficiency of his new radar safety device, which is being installed on all TWA planes and which will be available to all other airlines in the United States as soon as he can produce the equipment. The instrument warns the pilot by a brilliant red light and a warning horn the instant the plane comes too close to the ground, or any building, bridge, mountain, aircraft or other obstacle, regardless of darkness or weather conditions. The device weighs only 16 pounds and costs about $130. (Arrow points to warning lights on instrument panel). Center photo shows the Hughes-piloted Constellation approaching a mountain in Southern California's Santa Monica Range, an area usually voided by pilots because of its dangerous peaks. This particular plane's radar set was equipped with both 500-feet and 2,000-feet warning signals. The 500-feet warning range now being installed on TWA airliners was developed first because the greatest immediate need for it is during approaches and landings. The 2,000-feet warning is designed from enroute flying to guarantee clearance of mountains and other obstacles. Photo at right shows the Constellation veering to the left and climbing at a speed of 300 miles an hour after receiving radar warning of an obstacle in its flight path."