49 USC 47508 – Noise standards for air carriers and foreign air carriers providing foreign air transportation
(a)
(1) the Secretary prescribed for new subsonic aircraft in regulations of the Secretary in effect on January 1, 1977; or
(2) of the International Civil Aviation Organization that are substantially compatible with standards of the Secretary for new subsonic aircraft in regulations of the Secretary at parts 36 and 91 of title 14, Code of Federal Regulations, prescribed between January 2, 1977, and January 1, 1982.
(b)
(c)