Largest flying boat ever built. Largest aircraft wingspan ever. Heavy transport aircraft. The Hughes H-4 Hercules, also known as the Spruce Goose! The Spruce Goose was a beast of an airplane that made its only flight in 1947, a singular entity preserved in the Evergreen Aviation Museum in Oregon. Ship builder and magnate Henry Kaiser generated the operations concept for the plane and turned to Howard Hughes for the design and construction…. Read More