The Boeing 737 MAX is a fourth-generation variant of Boeing's 737 narrow-body aircraft series, introduced in 2017 with more fuel-efficient LEAP-1B engines and advanced winglets. Designed for short- to medium-haul routes, it became a key product for airlines seeking lower operating costs. The model faced global grounding from March 2019 to late 2020 following two fatal crashes linked to its MCAS flight control system. After software and training updates, it returned to service and remains central to Boeing's commercial strategy.