Boeing 737 Classic

The Boeing 737 Classic refers to the -300/-400/-500 series of the Boeing 737. It is the second generation derivative of the 737, following 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 and can seat between 145 and 188 passengers. Improvements over the previous generation of 737 aircraft included CFM International CFM56 high bypass ratio turbofan engines, upgraded avionics, and increased passenger 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, which entered service in 1988, followed by 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.