The Boeing 737 Family is a series of airliners released by Boeing. It is a twin-engined narrowbody, intended for short and medium distance flights. There are 10 variants in the 737 family, with capacity ranging from 85-215 passengers. The 737 Family is the most successful line of commercial airliners in history. As of late 2015 Boeing had about 8,800 737 orders will with about 4,200 unfilled orders.
737 Original Series
Boeing began design of the original 737 in May of 1964. Because it was already behind competitors like BAC, Douglas, and Fokker, Boeing used several elements of the 727 to speed up design. On December 28, 1967, Lufthansa received the first 737-100. On April 28, 1968, United received the first 737-200.
Boeing 737 Classic
The Boeing 737 Classic is the 737's second generation derivative. The 737-300, entered service in 1984, followed by the 737-400 in 1988, and finally the 737-500 in 1990. Improvements over the 737 Original Series included CFM International CFM56 high-bypass-ratio turbofan engines and upgraded avionics.
Boeing 737 Next Generation
Launched in 1993, the 737 Next Generation features a larger wing, winger wingspan, and greater fuel capacity than the 737 Classic. It also has longer ranger and available higher MTOW specifications than its predecessor.
Boeing 737 MAX
Boeing launched the 737 MAX series on August 30, 2011, and the FAA certified the new series on March 8, 2017. The series has four variants, the 737 MAX 7, MAX 8, MAX 9, and MAX 10. The airplanes typically offer 138 to 230 seats and a 3,215 to 3,825 nmi (5,954 to 7,084 km) range.
After two similar fatal MAX 8 crashes in October 2018 and March 2019, authorities indefinitely grounded the MAX series worldwide in March 2019.
737-700ER (Extended Range)
Boeing Business Jet
The 737 Orginal Series' competitors include the DC-9, BAC-111, B 747, and F28 Fellowship. Both the Original Series and Classic Series were much more popular then all three of them
The 737 Family's most notable competitor is Airbus's A320 Family. Direct competitors include the A320 and the 737-800, the A321 and the 737-900, and the A319 and the 737-700. By late 2015, Boeing had filled about 2,300 more orders then Airbus, but Airbus had about 900 more unfilled orders.