Boeing 737

The Boeing 737 is a short- to medium-range twinjet narrow-body airliner 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 was originally envisioned in 1964. The initial 737-100 made its first flight in April 1967, and entered airline service in February 1968 at Lufthansa. Next, the lengthened 737-200 entered service in April 1968. In the 1980s, Boeing launched the longer −300, −400, and −500 models, subsequently referred to as the Boeing 737 Classic series and featuring CFM56 turbofan engines along with wing improvements.

The 737 Next Generation was introduced in the 1990s, with a redesigned, increased span laminar flow wing, upgraded "glass" cockpit, and new interior. The 737 Next Generation comprises the four −600, −700, −800, and −900 models, with lengths ranging from 102 to 138 ft (31.09 to 42.06 m). Boeing Business Jet versions of the 737 Next Generation are also produced. The 737 was revised again in the 2010s for greater efficiency, with the 737 MAX series featuring CFM International LEAP-1B engines and improved winglets. The 737 MAX entered service in 2017.

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.

The 737 is operated by more than 500 airlines, flying to 1,200 destinations in 190 countries. With over 10,000 aircraft ordered, over 7,000 delivered, and over 4,500 still in service, at any given time there are on average 1,250 airborne worldwide. On average, somewhere in the world, a 737 took off or landed every five seconds in 2006. Since entering service in 1968, the 737 has carried over 12 billion passengers over 74 billion miles (120 billion km; 65 billion nm ) , and has accumulated more than 296 million hours in the air. The 737 represents more than 25% of the worldwide fleet of large commercial jet airliners.

The Boeing 737 Classics and the Boeing 737 Next Generation have faced main challenges from the Airbus A320 family introduced in 1988, which was developed to compete also with the McDonnell Douglas MD-80/90 series and the Boeing 717 (formerly named McDonnell Douglas MD-95).

Boeing has shipped 9,716 aircraft of the 737 family since late 1967, with 8,210 of those deliveries since March 1, 1988, and has a further 4,431 on firm order as of September 2017. In comparison, Airbus has delivered 7,771 A320 series aircraft since their certification/first delivery in early 1988, with another 5,520 on firm order (as of September 2017).

As of October 2015, a total of 368 aviation accidents and incidents involving all 737 aircraft have occurred, including 184 hull loss accidents resulting in a total of 4,862 fatalities. The 737 has also been in 111 hijackings involving 325 fatalities.

An analysis by Boeing on commercial jet airplane accidents in the period 1959–2013 showed that the original series had a hull loss rate of 1.75 per million departures versus 0.54 for the classic series and 0.27 for the Next Generation series.

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