NASA and Lockheed Martin recently released photos of the X-59 "quiet" supersonic jet conducting tests of its afterburner, blasting out a column of fire while in the hangar.

Lockheed Martin’s mysterious hypersonic aircraft ... facility at the Skunk Works headquarters in Palmdale, California, dubbed ...

Lockheed Martin has been building the X-59 for NASA ... in a hangar at Lockheed Martin's storied Skunk Works facility in Palmdale, California while performing afterburner engine run tests.