Grumman G-21 Goose – Cost: Unknown
The G-21 Goose (first flight was in 1937) was Grumman’s first for a lot of things. The G-21 was the first single-wing aircraft, first twin-engine aircraft, and the first aircraft used as a commercial airliner – pretty impressive history right there. Capable on both water and land, this aircraft served for many decades in a variety of roles. The long-lasting nature of this aircraft is a testament to it’s engineering and design. The G-21 was designed as an “air yacht” for wealthy New York businessmen, so they could commute from their homes on Long Island to their Manhattan offices. It soon found a market as an airliner, military transport, and utility aircraft.