Spruce Goose (Hughes H-4)

The largest flying boat ever built, which flew exactly once/Aircraft

The Hughes H-4 Hercules, better known as the Spruce Goose, has the largest wingspan of any aircraft that has ever flown. Built almost entirely of birch wood due to wartime material restrictions, it was designed by Howard Hughes to transport troops across the Atlantic. It flew exactly once on November 2, 1947, reaching an altitude of 21 meters for about a mile, which Hughes considered a roaring success.