Cessna 337 SkymasterCessna 337 Skymaster airplane model. The Model 336 Skymaster first flew on February 18 1961, but significant improvements to the design were made before production aircraft were delivered. Changes included more powerful engines, a larger fuselage with seating for six, and revised wing, tail and rear engine cowling. The 336 was delivered from mid 1963 and production lasted until late 1964 when it was replaced by the 337 Super Skymaster ('Super' was