NASA's X-59 'quiet' supersonic jet test fires engine for 1st time 

 NASA's revolutionary X-59 jet is steadily progressing toward its first flight test after completing a set of engine run tests at the storied Lockheed Martin Skunk Works facility in California. 

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https://www.space.com/space-exploration/tech/nasas-x-59-quiet-supersonic-jet-test-fires-engine-for-1st-time