Grumman G-21 Goose
In 1936, some rich residents of Long Island, such as E. Roland Harriman, asked Grumman to build them an aircraft. They would use this aircraft to fly to New York City. The G-21 was designed after this. It was an all-metal, high-winged monoplane powered by two  Pratt & Whitney R-985 Wasp Jr. nine-cylinder, air-cooled radial engines mounted on the leading edge of high-set wings. The deep fuselage served also as a hull and had hand-cranked retractable landing gear. First flight of the prototype took place on May 29, 1937.