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The Boeing 737 is a short- to medium-rangetwinjetnarrow-bodyairliner developed and manufactured by Boeing Commercial Airplanes in the United States. Originally developed as a shorter, lower-cost twin-engine airliner derived from the 707 and 727, the 737 has developed into a family of ten passenger models with capacities from 85 to 215 passengers. The 737 is Boeing's only narrow-body airliner in production, with the 737 Next Generation(-700, -800, and -900ER) and the re-engined and redesigned 737 MAX variants currently being built.
The 737 series is the best-selling commercial jetliner in history. The 737 has been continuously manufactured by Boeing since 1967, with 9,716 aircraft delivered and 4,431 orders yet to be fulfilled as of September 2017.Assembly of the 737 is performed at the Boeing Renton Factory in Renton, Washington. Many 737s serve markets previously filled by 707, 727, 757, DC-9, and MD-80/MD-90 airliners, and the aircraft currently competes primarily with the Airbus A320 family. As of 2006, there were an average of 1,250 Boeing 737s airborne at any given time, with two departing or landing somewhere every five seconds.