This NASA image released April 3, 2018 shows an artist’s concept of the low- boom flight demonstrator outside the Lockheed Martin Aeronautics Company’s Skunk Works hangar in Palmdale, California. NASA has inked a deal with Lockheed Martin to develop a supersonic “X- plane” that could break the sound barrier without a sonic boom, officials said April 3, 2018. (Photo by AFP Photo/NASA)
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