The Boeing 737
The Boeing 737 is a medium-range twin-engine narrow-body jet airliner.
Originally it was developed with the intentions to be a low-cost jet airliner based upon the Boeing’s 707 & 727. The 737 is Boeing’s only narrow-body airliner and depending on the 9 models/versions, it has a capacity of 85 up to 215 passengers. The 737 is Boeing's only narrow-body airliner in production, with the -600, -700, -800, and -900ER variants currently being built. A re-engined and redesigned version, the 737 MAX, is set to debut in 2017.
Originally envisioned in 1964, the initial 737-100 flew in 1967 and entered service in February 1968
The longer 737-200 entered service in April 1968. In the 1980s Boeing the -300, -400, and -500 models were launched. The 737 Classics added capacity and incorporated CFM56 turbofan engines along with wing improvements.
In the 1990s Boeing introduced the 737 Next Generation with multiple changes including a redesigned wing, upgraded cockpit, and new interior. The 737 Next Generation comprises the four -600, -700, -800, and -900ER models, ranging from 31.09m 42.06 m in length.
With 7,425 aircraft delivered and 3,074 orders yet to be fulfilled as of December 2012 The 737 series is the best-selling jet airliner in the history of aviation. 737 assembly is centered at the Boeing Renton Factory in Renton, Washington. The aircraft currently competes primarily with the Airbus A320.
The Boeing 737 can very easily be recognized among other Boeings since it’s the only airline without gear covers.
The engines on the recent 737 Classic series (300, 400, 500) and Next-Generation series (600, 700, 800, 900) do not have circular inlets like most aircraft.