Flight Operations

Part 91 - General Operating Rules

Basic rules for operating an aircraft within the United States

Part 121 - Commercial Operations

Rules for scheduled air carriers and operations

Part 135 - Commuter and Charter Flights

Rules for commuter and on-demand operations

Licensing & Certification

Part 61 - Pilot Certification

Requirements for pilot certification and ratings

Part 67 - Medical Standards

Medical certification requirements for pilots

Part 141 - Flight Schools

Requirements for certified flight schools

Aircraft Requirements

Part 21 - Certification Procedures

Aircraft certification and airworthiness requirements

Part 43 - Maintenance

Maintenance, preventive maintenance, and alterations

Part 45 - Identification

Aircraft registration and marking requirements

Safety & Security

Part 107 - Drone Operations

Rules for commercial drone operations

Part 139 - Airport Certification

Requirements for airports serving commercial aircraft

Part 1544 - Aircraft Security

Security requirements for aircraft operators