partnerships in United States aeronautics research going forward. 504. Experimental aircraft demonstrations (a) In general The Administrator shall study, develop, and carry out large-scale testing and demonstrations in relevant environments that are needed to understand complex, transformational flight systems, including structures, aerodynamics, propulsion, controls and flight dynamics interactions, and advanced technologies and systems for their transition into aircraft and airspace systems by the aviation community. (b) Experimental aircraft demonstrations In meeting the objectives established in subsection (a), the Administrator shall carry out experimental aircraft demonstrations, including a— (1) subsonic demonstrator to demonstrate the performance and feasibility of advanced, ultra-efficient subsonic flight demonstrator configurations