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X-54A designation issued as placeholder for future boom research aircraft
X-PLANE EXPLAINED: The U.S. Air Force has issued the designation X-54A for an experimental supersonic aircraft to gather sonic boom data, but don’t expect anything to fly soon. NASA says it supported an application by Gulfstream for an X-plane designation, but sees it as a placeholder. “NASA is not actively working with Gulfstream on this project and is not discussing cooperation,” the agency says. But it does not preclude future cooperation.