The General Electric GE9X is a high-bypass turbofan developed by GE Aviation exclusively for the Boeing 777X. It first ran on the ground in April 2016 and first flew on March 13, 2018; it powered the 777-9's maiden flight in early 2020. It received its Federal Aviation Administration (FAA) type certificate on September 25, 2020. Derived from the General Electric GE90 with a larger fan, advanced materials like ceramic matrix composites (CMCs), and higher bypass and compression ratios, it should improve fuel efficiency by 10% over its predecessor. It is rated at 110,000 lbf (490 kN) of thrust, which is less than its predecessor, the GE90-115 rated at 115,000 lbf (510 kN).