NASA has revealed 3 concept designs for quiet, energy efficient aircraft that potentially could be ready for flight by 2025. 3 companies-Boeing, Northrop Grumman and Lockheed Martin came up with designs and all 3 won a contract from NASA to research, develop and test their concepts. All 3 designs were required to have green credentials. Pictured from the top are the concepts from Boeing, Northrop Grumman and Lockheed Martin.
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