Sec. 91.853 - Final compliance: Civil subsonic
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) of this subpart, unless that airplane has
been shown to comply with Stage 3 noise levels.
[Doc. No. 26433, 56 FR 48658, Sept. 25, 1991]