Ground Tests Finished For NASA X-59 QueSST A few days ago NASA announced that the X-59 Quiet SuperSonic Technology (QueSST) has now returned to Lockheed Martin’s Skunk Works factory in Palmdale, California. It will now move on to the next phase of assembly and final integration. The experimental craft was in Fort Worth, Texas conducting intensive ground testing. The X-59 is experimental and being used as a Low Boom Flight Demonstration aircraft to help shape and finesse forthcoming regulations around future supersonic flight over land. When the Concorde flew they only could fly supersonic over the ocean as a result of the sonic boom that is created as the aircraft makes during transition from subsonic to supersonic. Photos by: NASA/Lauren Hughes.