; (2) in paragraph (15) by striking the period at the end and inserting a semicolon; and (3) by adding at the end the following new paragraphs: (16) $255,130,000; for fiscal year 2024; (17) $261,000,000 for fiscal year 2025; (18) $267,000,000 for fiscal year 2026; (19) $273,000,000 for fiscal year 2027; and (20) $279,000,000 for fiscal year 2028. . I FAA Research and Development Organization 101. Report on implementation; funding for safety research and development Not later than one year after the date of the enactment of this Act, the Comptroller General of the United States shall submit to the appropriate committees of Congress a report on the allocation of funding pursuant to section 48102 of title 49, United States Code, to the Secretary of Transportation to conduct civil aviation research and development and to assess the implementation of section 48102(b)(2) of such title. II FAA Research and Development Activities 201. Aviation fuel research, development, and usage (a) Roadmap Not later than nine months after the date of the enactment of this Act, the Secretary of Transportation shall coordinate with the Administrator of NASA, the Secretary of Energy, and the Administrator of the Environmental Protection Agency, and consult relevant stakeholders, including those in industry and academia, to prepare and submit to the appropriate committees of Congress a coordinated research and development roadmap to safely eliminate the use of leaded aviation fuel in existing and future certified piston-engine aircraft. Such roadmap shall— (1) identify activities to accelerate the development, testing, and certification of safe and lead-free fuel for use in general aviation aircraft, including requisite airport refueling infrastructure