Materials contain photographs of the HK-1 Hercules, otherwise known as the "Spruce Goose" or the "Flying Boat," from 1942 to 1947. The photographs primarily depict the construction, transportation, and storage of the plane, but also include photographs of the first and only test flight of the HK-1 above Los Angeles Harbor in 1947. Howard Hughes designed the HK-1 as the world's largest plane, capable of transporting large quantities of U.S. military hardware and personnel. In 1947, under the program's new designation H-4 Hercules, Hughes had the plane transported from his factory in Culver City, California to Los Angeles Harbor. On November 2, he piloted the plane during its only test flight. The U.S. Air Force abandoned the controversial project, and Hughes was called to testify before the Truman Committee of the U.S. Senate to justify the use of government funds on a program that never succeeded.

Materials depict the celebrations of Howard Hughes's circumnavigation flight in 1938. Along with a crew consisting of Harry Connor, Tom Thurlow, Richard Stoddart, and Ed Lund, Hughes flew the Super Electra on a global circumnavigation flight. On July 10, 1938, Hughes and the crew departed Floyd Bennett Field in New York and flew to Paris, France, Moscow, Russia, Omsk, Russia, Yakutsk, Russia, Fairbanks, Alaska, and Minneapolis, Minnesota before landing back in New York on July 14. The photographs primarily depict the parades thrown for Hughes after completion of the flight. The photographs also depict Hughes and his crew meeting with New York City Mayor Fiorello La Guardia at New York City Hall, the National Press Association, and crowds of onlookers who attended the plane's landings in various cities.