Part 121 Operations

Part 121 Operations refer to the regulations that govern the routine management of scheduled airline flights in the United States. These rules ensure airlines maintain safety, reliability, and efficiency by setting standards for aircraft maintenance, crew training, operational procedures, and safety protocols. Airlines operating under Part 121 are typically large commercial carriers that provide regular passenger and cargo services. Compliance with these regulations helps guarantee safe and consistent air travel, covering everything from flight planning and crew duty hours to aircraft inspections and emergency procedures.