BOEING B737-400F

The Boeing 737 Classic is the second generation of the Boeing 737 jetliner, comprising the -300, -400, and -500 series. It follows the original -100/-200 models that began production in 1966. They are short- to medium-range, narrow-body jet airliners. Produced by Boeing Commercial Airplanes from 1984 to 2000, the 737 Classic includes three variants. Improvements over the previous generation of 737 aircraft included CFM International CFM56 high-bypass-ratio turbofan engines, upgraded avionics, and increased cargo capacity (in the -300/-400 models).

The first model of the Classic series, the 737–300, entered service in 1984. It was followed by a stretched model, the 737-400, that entered service in 1988, followed by the shortened 737-500, the smallest variant in the classic series, in 1990. In total, 1,988 aircraft were delivered. The Classic series was introduced as the new generation of the 737, but following the introduction of the 737 Next Generation in the mid-1990s, was officially designated as the 737 Classic series.

Aircraft of similar capability and era are: Tupolev TU-154.