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supersonic x plane
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NASA hires Lockheed Martin to build quiet, supersonic ‘X-plane’
By HT Correspondent | Agence France-Presse, Washington
UPDATED ON APR 04, 2018 10:20 AM IST
As early as mid-2022, NASA plans to fly the X-plane over certain, yet-to-be-determined US cities to collect data and gather community responses.