In 2016, Boeing planned to improve its range from 3,510 nautical miles (6,500km; 4,040mi) to 3,605nmi (6,676km; 4,149mi) after 2021. Boeing-Hosts-China-President-Xi-Jinping-Announces-Airplane-Sales-Expanded-Collaboration-with-Chinas-Aviation-Industry" (Press release). In August 2011, Boeing had to choose between 66-inch (168cm) or 68-inch (173cm) fan diameters, necessitating landing gear changes to maintain a 17in (43cm) ground clearance beneath the new engines; Boeing Commercial Airplanes chief executive officer Jim Albaugh stated "with a bigger fan you get more efficiency because of the bypass ratio [but also] more weight and more drag", with more airframe changes.

The two- spool design has a low-pressure section comprising the fan and three booster stages driven by five axial turbine stages and a high-pressure section with a 10-stage axial compressor driven by a two-stage turbine. In 2006, Boeing started considering the replacement of the 737 with a "clean-sheet" design that could follow the Boeing 787 Dreamliner. The 737 MAX is based on earlier 737 designs, with more efficient CFM International LEAP-1B engines, aerodynamic changes including distinctive split-tip winglets, and airframe modifications.From mid-April 2019, Boeing announced that it was temporarily cutting production of the 737 aircraft from 52 per month to 42 amid the 737 MAX groundings. Thanks to the twenty year experience in the vending machine field, Flymax is able to produce custom vending machines with passion, quality and tecnological innovation combining the economic growth with the respect for the environment , the resource and energy optimization. In November 2014, McNerney said the 737 would be replaced by a new airplane by 2030—probably using composite materials—that would be slightly bigger and have new engines, but would retain the 737's general configuration. A MAX8 with 162 passengers on a 3,000 nautical miles (5,600km; 3,500mi) flight is projected to have a 1.

The Indian Directorate General of Civil Aviation (DGCA) rescinded its ban on MAX airplanes in late August on the condition that they meet the requirements set by the FAA and EASA. The 737 MAX7, MAX8 (including the 200–seat MAX 200), and MAX9 are intended to replace the 737-700, -800, and -900 respectively, and a further-stretched 737 MAX10 is available. The similarity of the physical and flight data evidence from the accidents led to the global 737 MAX groundings beginning on the day of the second accident. Boeing Commercial Airplanes CEO Jim Albaugh said in 2011, that adding more fly-by-wire control systems would be "very minimal". seating 12–18 more passengers for 192–198 in a dual-class layout or 226-232 for a single class, needing an uprated 31,000 pounds-force (140kN) LEAP-1B that could be available by 2019, or 2020, and would likely require a landing-gear modification to move the rotation point slightly aft.The variant made its maiden flight on June 18, 2021, initiating its flight test and certification program. The new engine nacelle included chevrons, similar to those of the Boeing 787, which also helped to reduce engine noise. Norwegian Air International was the second airline to put a 737 MAX into service, when it performed its first transatlantic flight with a MAX8 named Sir Freddie Laker on July 15, 2017, between Edinburgh Airport in Scotland and Bradley International Airport in the U. As of October2022 [update], the five largest operators of the Boeing 737 MAX were Southwest Airlines (207), United Airlines (145), Ryanair Holdings (126), Alaska Airlines (59), and American Airlines (53). In mid-2011, one design objective was matching fuel burn of the 737 MAX to that of the Airbus A320neo's 15% fuel-burn advantage.

The modest stretch of the MAX10 enables the aircraft to retain the existing wing, and the Leap 1B engine from the MAX9 with a trailing-link main landing gear as the only major change. After the announcement, Moody's cut Boeing's debt ratings in December, citing the rising costs due to the grounding and the production halt including financial support to suppliers and compensation to airlines and lessors which could lower the program's margins and cash generation for years. with an airliner layout, flew function-and-reliability certification for 300 hours with a light flight-test instrumentation. The larger engine is cantilevered ahead of and slightly above the wing, and the laminar flow engine nacelle lipskin is a GKN Aerospace one-piece, spun-formed aluminum sheet inspired by the 787. Postcodes outside of Zone 1 (including some areas within mainland UK) may incur extra carriage charges due to surcharges imposed by the couriers.Hyperdrug Pharmaceuticals Limited (Registered in England and Wales with Company Number 01898060) previously registered as Hyperdrug Ltd. China became the first air authority to ground the aircraft on March 11, 2019, setting a worldwide precedent as Singapore, India, Turkey, South Korea, the European Union, Australia and Malaysia followed the next day. In 2011, the CFM LEAP-1B engine was initially 10–12% more efficient than the previous 61-inch (156cm) CFM56-7B of the 737NG. The FAA garnered criticism for defending the aircraft and was the last major authority to ground it.