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The Boeing 737 MAX and Airbus A320neo utilize the CFM International LEAP engine family, which offers a 15 percent improvement in fuel efficiency and reduced carbon emissions compared to previous models. The LEAP engine is produced by CFM International, a joint venture between GE Aerospace and Safran Aircraft Engines, designed to replace the CFM56 series.

The LEAP-1A engines power the A320neo, while the LEAP-1B engines are exclusive to the 737 MAX. The engines feature advanced technologies, including 3D-woven carbon fiber composite fan blades, resulting in lower fuel consumption and CO2 emissions.

The LEAP engines are also compatible with Sustainable Aviation Fuel (SAF) and are expected to achieve 100 percent SAF compatibility shortly. Both aircraft benefit from a high dispatch reliability rate of 99.98 percent, enhancing operational stability for airlines.