14 CFR § 91.881
Final compliance: Civil subsonic jet airplanes weighing 75,000 pounds or less
July 13, 2020
Except as provided in §91.883, after December 31, 2015, a person may not operate to or from an airport in the contiguous United States a civil subsonic jet airplane subject to §91.801(e) of this subpart that weighs less than 75,000 pounds 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]