DefenceTalkNASA 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 Tuesday. The $247.5 million contract allows for the design, building and testing of a plane that would make its first test flight in 2021, NASA said. The experimental plane “will […]https://www.defencetalk.com/nasa-hires-lockheed-martin-to-build-quiet-supersonic-x-plane-71618/