U.S. Code of Federal Regulations

Regulations most recently checked for updates: Oct 30, 2025

All TitlesTitle 14Chapter IPart 91Subpart I - Subpart I—Operating Noise Limits
§ 91.801 - Applicability: Relation to part 36.
§ 91.803 - Part 125 operators: Designation of applicable regulations.
§ 91.805 - Final compliance: Subsonic airplanes.
§§ 91.807-91.813 - §[Reserved]
§ 91.815 - Agricultural and fire fighting airplanes: Noise operating limitations.
§ 91.817 - Civil aircraft sonic boom.
§ 91.818 - Special flight authorization to exceed Mach 1.
§ 91.819 - Civil supersonic airplanes that do not comply with part 36.
§ 91.821 - Civil supersonic airplanes: Noise limits.
§§ 91.823-91.849 - §[Reserved]
§ 91.851 - Definitions.
§ 91.853 - Final compliance: Civil subsonic airplanes.
§ 91.855 - Entry and nonaddition rule.
§ 91.857 - Stage 2 operations outside of the 48 contiguous United States.
§ 91.858 - Special flight authorizations for non-revenue Stage 2 operations.
§ 91.859 - Modification to meet Stage 3, Stage 4, or Stage 5 noise levels.
§ 91.861 - Base level.
§ 91.863 - Transfers of Stage 2 airplanes with base level.
§ 91.865 - Phased compliance for operators with base level.
§ 91.867 - Phased compliance for new entrants.
§ 91.869 - Carry-forward compliance.
§ 91.871 - Waivers from interim compliance requirements.
§ 91.873 - Waivers from final compliance.
§ 91.875 - Annual progress reports.
§ 91.877 - Annual reporting of Hawaiian operations.
§§ 91.879-91.880 - §[Reserved]
§ 91.881 - Final compliance: Civil subsonic jet airplanes weighing 75,000 pounds or less.
§ 91.883 - Special flight authorizations for jet airplanes weighing 75,000 pounds or less.
§§ 91.884-91.899 - §[Reserved]
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