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The Boeing 737 MAX is the fourth generation of the Boeing 737, a narrow-body airliner manufactured by Boeing Commercial Airplanes (BCA). It succeeds the Boeing 737 Next Generation (NG). It is based on earlier 737 designs, with more efficient CFM International LEAP-1B engines, aerodynamic changes including its distinctive split-tip winglets, and airframe modifications.[9]

The new series was publicly announced on August 30, 2011.[10] It took its maiden flight on January 29, 2016[1] and gained FAA certification in March 2017.[11][9] The first delivery was a MAX 8 in May 2017, to Malindo Air,[12] with whom it commenced service on May 22, 2017.[2]

The 737 MAX series has been offered in four variants, offering 138 to 204 seats in typical two-class configuration[13] and a 3,215 to 3,825 nmi (5,954 to 7,084 km) range. The 737 MAX 7, MAX 8 (including the denser, 200–seat MAX 200), and MAX 9 are intended to replace the 737-700, -800, and -900, respectively.[9] Additional length is offered with the further stretched 737 MAX 10. As of December 2019, the Boeing 737 MAX had received 4,932 firm orders and delivered 387 aircraft.[5]

In the aftermath of two fatal accidents, Lion Air Flight 610 and Ethiopian Airlines Flight 302, the 737 MAX was grounded worldwide in March 2019.[14] Boeing implemented changes to its flight control system and pilot training, and expected the airliner to be flying again by mid-2020.[15] Boeing subsequently suspended production in January 2020 with approximately 400 MAX airplanes awaiting delivery;[16] production resumed in May 2020 at a low rate.[4] Between June 29 and July 1, 2020, the FAA and Boeing conducted a series of recertification test flights. Several key tasks remain before the grounding order can be lifted.