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Part 121
§ 121.591

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14 CFR · Part 121

14 CFR § 121.591

Applicability.

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Read in Subpart U

Part 121 Contents

Subpart A: General
Subpart E: Approval of Routes: Domestic and Flag Operations
Subpart F: Approval of Areas and Routes for Supplemental Operations
Subpart G: Manual Requirements
Subpart H: Aircraft Requirements
Subpart I: Airplane Performance Operating Limitations
Subpart J: Special Airworthiness Requirements
Subpart K: Instrument and Equipment Requirements
Subpart L: Maintenance, Preventive Maintenance, and Alterations
Subpart M: Airman and Crewmember Requirements
Subpart N: Training Program
Subpart O: Crewmember Qualifications
Subpart P: Aircraft Dispatcher Qualifications and Duty Time
Subpart Q: Flight Time Limitations and Rest Requirements: Domestic Operations
Subpart R: Flight Time Limitations: Flag Operations
Subpart S: Flight Time Limitations: Supplemental Operations
Subpart T: Flight Operations
Subpart U: Dispatching and Flight Release Rules
Subpart V: Records and Reports
Subpart W: Crewmember Certificate: International
Subpart X: Emergency Medical Equipment and Training
Subpart Y: Advanced Qualification Program
Subpart Z: Hazardous Materials Training Program
Subpart AA: Continued Airworthiness and Safety Improvements
Subpart DD: Special Federal Aviation Regulations
Appendix A to Part 121: First Aid Kits and Emergency Medical Kits
Appendix B to Part 121: Airplane Flight Recorder Specification
Appendix C to Part 121: C-46 Nontransport Category Airplanes
Appendix D to Part 121: Criteria for Demonstration of Emergency Evacuation Procedures Under § 121.291
Appendix E to Part 121: Flight Training Requirements
Appendix F to Part 121: Proficiency Check Requirements
Appendix G to Part 121: Doppler Radar and Inertial Navigation System (INS): Request for Evaluation; Equipment and Equipment Installation; Training Program; Equipment Accuracy and Reliability; Evaluation Program
Appendix H to Part 121: Advanced Simulation
Appendix K to Part 121: Performance Requirements for Certain Turbopropeller Powered Airplanes
Appendix L to Part 121: Type Certification Regulations Made Previously Effective
Appendix M to Part 121: Airplane Flight Recorder Specifications
Appendix O to Part 121: Hazardous Materials Training Requirements For Certificate Holders
Appendix P to Part 121: Requirements for ETOPS and Polar Operations

This subpart prescribes dispatching rules for domestic and flag operations and flight release rules for supplemental operations.

Reflects the eCFR edition current as of September 29, 2026. Retrieved from ecfr.gov on October 16, 2026.

Primary Source

Official Source (14 CFR · Part 121)