LOS ANGELES—Final flight tests of GE Aviation's GE9X turbofan have been completed on the company’s 747-400 flying testbed ahead of the engine’s first flight this summer on the Boeing 777-9, the initial version of the aircraft manufacturer’s new 777X twinjet series. The flight test campaign, which began in December 2018, stretched over more than 50 flights and 320 flight hours, and followed an earlier preliminary test program between March and May 2018 which ...

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