The Hughes H-4 Hercules (also known as the "Spruce Goose"; registration NX37602) is a prototype heavy transport aircraft designed and built by the Hughes Aircraft company. The aircraft made its only flight on November 2, 1947, and the project never advanced beyond the single example produced. Built from wood because of wartime restrictions on the use of aluminum and concerns about weight, its critics nicknamed it the "Spruce Goose", despite it being made almost entirely of birch rather than spruce.[1] The Hercules is the largest flying boat ever built and has the largest wingspan of any aircraft in history.[2] It survives in good condition at the Evergreen Aviation & Space Museum in McMinnville, Oregon, USA.
Howard Hughes designed the aircraft to carry 750 armed troops but the US government did not award him a contract. It's maiden and only flight was for only 1.6 km after which Howard parked the aircraft and it never flew again.