; (ii) the NASA 2014 Strategic Plan; (iii) the Aeronautics Strategic Implementation Plan; and (iv) any updates to the programs called for in the plans described in clause (i) through (iii); and (3) a level of funding that adequately supports full-scale experimentation and related infrastructure must be assured over a sustained period of time to restore NASA’s capacity to see legacy priority programs through to completion and achieve national economic and security objectives. (b) National policy It is the policy of the United States to maintain world leadership in military and civilian aeronautical science and technology, global air power projection, and industrial leadership. To this end, one of the fundamental objectives of NASA aeronautics research is the steady progression and expansion of high-speed flight research and capabilities, including the science and technology of critical underlying disciplines and competencies, chief among which are computational-based analytical and predictive tools and methodologies, aerothermodynamics, high-speed flight propulsion, advanced materials and manufacturing processes, high-temperature structures and materials, and flight controls. (c) Establishment of experimental plane projects The Administrator shall establish the following projects: (1) A low-boom supersonic aircraft project that will— (A) demonstrate supersonic aircraft designs and technologies that reduce sonic boom noise to levels that encourage the repeal of domestic and international bans on supersonic flight overland; and (B) gather the data needed to support informed decisions of the Federal Aviation Administration regarding overland supersonic flight. (2) A series of large-scale X-Plane demonstrators developed sequentially or in parallel, each based on a set of new configuration concepts or technologies determined by the Administrator— (A) to demonstrate aircraft vehicle and propulsion concepts and technologies and related advances in alternative propulsion and energy