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Regulations last checked for updates: Dec 15, 2025
Title 14 - Aeronautics and Space last revised: Nov 03, 2025
All Titles
Title 14
Chapter I
Part 121
Subpart S - Subpart S—Flight Time Limitations: Supplemental Operations
§ 121.500 - Applicability.
§ 121.503 - Flight time limitations: Pilots: airplanes.
§ 121.505 - Flight time limitations: Two pilot crews: airplanes.
§ 121.507 - Flight time limitations: Three pilot crews: airplanes.
§ 121.509 - Flight time limitations: Four pilot crews: airplanes.
§ 121.511 - Flight time limitations: Flight engineers: airplanes.
§ 121.513 - Flight time limitations: Overseas and international operations: airplanes.
§ 121.515 - Flight time limitations: All airmen: airplanes.
§ 121.517 - Flight time limitations: Other commercial flying: airplanes.
§ 121.519 - Flight time limitations: Deadhead transportation: airplanes.
§ 121.521 - Flight time limitations: Crew of two pilots and one additional airman as required.
§ 121.523 - Flight time limitations: Crew of three or more pilots and additional airmen as required.
§ 121.525 - Flight time limitations: Pilots serving in more than one kind of flight crew.
§ 121.527 - Fatigue risk management system.
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