Title 14
SECTION 91.821
91.821 Civil supersonic airplanes: Noise limits.
§ 91.821 Civil supersonic airplanes: Noise limits.Except for Concorde airplanes having flight time before January 1, 1980, no person may operate in the United States, a civil supersonic airplane that does not comply with Stage 2 noise limits of part 36 in effect on October 13, 1977, using applicable trade-off provisions.