The Boeing 737 Next Generation, commonly abbreviated as 737NG, or 737 Next Gen, is a twin-engine narrow-body aircraft produced by Boeing Commercial Airplanes. Launched in 1993 as the third generation derivative of the Boeing 737, it has been produced since 1997.[4]Boeing 737 Next Generation737-600/-700/-800/-900The 737-800 is the best-selling 737NG variant. Southwest Airlines (as seen in this January 2015 picture) is the largest operator.General informationTypeNarrow-body airlinerNational originUnited StatesManufacturerBoeing Commercial AirplanesStatusIn service, military variants in productionPrimary usersSouthwest AirlinesRyanairUnited AirlinesAmerican AirlinesNumber built7,113 as of January 2025[1]HistoryManufactured1996–2020 (civilian variants)[2]1996–present (military variants)Introduction dateDecember 17, 1997 with Southwest Airlines[3]First flightFebruary 9, 1997; 28 years agoDeveloped fromBoeing 737 ClassicVariantsBoeing Business JetBoeing C-40 ClipperBoeing E-7 WedgetailBoeing P-8 PoseidonDeveloped intoBoeing 737 MAXThe 737NG is an upgrade of the 737 Classic (–300/–400/–500) series. Compared to the 737 Classic, it has a redesigned wing with a larger area, a wider wingspan, greater fuel capacity, and higher maximum takeoff weights (MTOW) and longer range. It has CFM International CFM56-7 series engines, a glass cockpit, and upgraded and redesigned interior configurations. The series includes four variants, the –600/–700/–800/–900, seating between 108 and 215 passengers. The 737NG's primary competition is the Airbus A320 family.As of January 2025, a total of 7,126 737NG aircraft had been ordered, of which 7,113 had been delivered, with remaining orders for two -700, two -800, and 9 -800A variants. The most-ordered variant is the 737-800, with 4,991 commercial, 191 military, and 23 corporate, or a total of 5,205 aircraft. Boeing stopped assembling commercial 737NGs in 2019 and made the final deliveries in January 2020.[2] The 737NG is superseded by the fourth