X-59 Engine Roars, Lockheed Martin Starts Last Major Ground Test PR Newswire PALMDALE, Calif., Nov. 12, 2024 PALMDALE, Calif. , Nov. 12, 2024 /PRNewswire/ -- Lockheed Martin Skunk Works ® (NYSE: LMT), in partnership with NASA Aeronautics, started X-59 engine run testing, marking the aircraft's final major system check-out before taxi tests and first flight. The tests also mark the first time the X-59 was powered fully internally. During the tests, Lockheed Martin is verifying inlet and nozzle...