The Boeing 737 series was designed for the Worlds short-to-medium airliner market and was a two-engine narrow-body aircraft and made its first flight in April 1967.

The Boeing Model 40 series of light commercial biplanes was one of the first successful transport aircraft produced by the Boeing Airplane Co.

The Twin Bonanza was the first twin-engine, light commercial aircraft of post-war design to be produced in the United States.