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. The demonstrator, if built, would generate sonic ...

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