Following the success of the first generation series 737s Boeing developed further models, the 737-600, -700, -800 and –900, the –600 and –700 being the smaller aircraft in the new series and featured more efficient CFM56-7 turbofans, this engine combining the core of the CFM56-5 engine with the low pressure

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.