of National Environmental Policy Act (NEPA) categorical exclusions for vertiport projects. Sec. 824. Advanced Air Mobility Working Group amendments. Sec. 825. Rules for operation of powered-lift aircraft. Sec. 826. International coordination on powered-lift aircraft. Sec. 827. Advanced air mobility propulsion systems aviation rulemaking committee. TITLE IX—RESEARCH AND DEVELOPMENT AND INNOVATIVE AVIATION TECHNOLOGIES Sec. 901. Advanced materials center of excellence enhancements. Sec. 902. Center of excellence for unmanned aircraft systems. Sec. 903. ASSUREd safe credentialing authority. Sec. 904. FAA and NASA advanced aviation technologies pilot program. Sec. 905. Advancing global leadership on civil supersonic aircraft. Sec. 906. CLEEN engine and airframe technology partnership. Sec. 907. Hypersonic flight testing. Sec. 908. Hypersonic pathway to integration study. Sec. 909. Operating high-speed flights in high altitude Class E airspace. Sec. 910. Electric propulsion aircraft operations study. Sec. 911. Contract weather observers program. Sec. 912. Airfield pavement technology program. Sec. 913. National aviation research plan modification. Sec. 914. FAA and NASA research and development coordination review. Sec. 915. Research and development of FAA's aeronautical information systems modernization activities. Sec. 916. Center of Excellence for Alternative Jet Fuels and Environment. Sec. 917. Aircraft Noise Advisory Committee. TITLE X—MISCELLANEOUS Sec. 1001. Noise mitigation. TITLE XI—TECHNICAL CORRECTIONS Sec. 1101. Technical corrections. 2. Definitions In this Act: (1) Administrator Unless otherwise specified, the term Administrator means the Administrator of the Federal Aviation Administration. (2) Appropriate committees of Congress The term appropriate committees of Congress means the Committee on Commerce, Science, and Transportation of the Senate and the Committee on Transportation and Infrastructure of the House of Representatives . (3) Comptroller General The term Comptroller General means the