14 CFR § 91.853
Final compliance: Civil subsonic airplanes
July 13, 2020
Except as provided in §91.873, after December 31, 1999, no person shall operate to or from any airport in the contiguous United States any airplane subject to §91.801(c), unless that airplane has been shown to comply with Stage 3, Stage 4, or Stage 5 noise levels.
[Docket FAA-2015-3782, Amdt. 91-349, 82 FR 46132, Oct. 4, 2017]