The Boeing 737 MAX is a series of narrow-body aircraft produced by Boeing Commercial Airplanes, introduced in 2017 as an updated version of the Boeing 737. It incorporates LEAP-1B engines, advanced winglets, and improved aerodynamics to enhance fuel efficiency and reduce operating costs. The aircraft faced a global grounding from 2019 to 2020 following two fatal crashes linked to its MCAS system, leading to significant design and software changes before its return to service.