Hughes H-4 Hercules - the largest transport flying boat, developed by the American firm Hughes Aircraft. Developed under the guidance of Howard Hughes, this 136-ton plane which originally designated as НК-1 and has received an informal nickname the Elegant Goose or the Spruce Goose, was the biggest ever constructed flying boat. Plane Hercules piloted by Howard Hughes, has made the first and unique flight on November, 2nd, 1947 when of 21 metre has risen in air on height and has covered approximately one mile on a straight line over harbour of Los Angeles. After long storage, the plane has been sent in a museum Long Beach, California.
I saw the movie about Hughes and H-4 Hercules, nice story )
see also Largest Airplane In The World