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Washington: In a major step towards building an actual X-plane, NASA has completed the preliminary design review of its Quiet Supersonic Transport or QueSST aircraft design. QueSST is the initial design stage of the agency's planned Low Boom Flight Demonstration (LBFD) experimental airplane, otherwise known as an X-plane, NASA said in a statement on Tuesday. Senior experts and engineers from across the agency and the Lockheed Martin Corporation concluded that the QueSST design is capable of fulfilling the LBFD aircraft's mission objectives, which are to fly at supersonic speeds, but create a soft "thump" instead of the disruptive sonic boom associated…