14 C.F.R. § 91.821 Civil supersonic airplanes: Noise limits.
Title 14 - Aeronautics and Space
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.
Title 14: Aeronautics and Space
PART 91—GENERAL OPERATING AND FLIGHT RULES
Subpart I—Operating Noise Limits
§ 91.821 Civil supersonic airplanes: Noise limits.
