PALMDALE - It took more than six years and thousands of volunteer hours to transform a dusty corner into the Palmdale Plant 42 Heritage Airpark, a showcase for the many noteworthy aircraft conceived, designed, tested and built at the nearby facilities. Lovingly restored aircraft were silhouetted against the setting sun Friday night as guests gathered beneath an elegant tent to celebrate and officially dedicate the airpark and recognize the tremendous efforts of volunteers and donors to make it a reality. "There aren't many monuments dedicated to what (aerospace workers) have done," Mayor Jim Ledford said. "This is the beginning. This...