{"data":{"id":"us/14-cfr-91.821","jurisdiction":"us","citation":"14 CFR 91.821","heading":"Civil supersonic airplanes: Noise limits.","body":"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.","path":["Title 14—Aeronautics and Space","CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER F—AIR TRAFFIC AND GENERAL OPERATING RULES","PART 91—GENERAL OPERATING AND FLIGHT RULES","Subpart I—Operating Noise Limits"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-14.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:20Z","sha256":"59d87092cc845ee47da4fdacc8108cbfcf93de48db356e7da0f1386bb8c45c87","source_id":"us-cfr","stale":true,"prev":"us/14-cfr-91.819","next":"us/14-cfr-91.823-91.849"},"notice":"GroundRules: Original legal text. Not legal advice."}