What type of aircraft operations are regulated under Part 121 of the FAR?

The regulation of aircraft operations under Part 121 of the Federal Aviation Regulations (FAR) specifically pertains to scheduled air carriers and the operation of large aircraft. This part establishes comprehensive rules for the operation of commercial air transport operations that include scheduled services using larger aircraft, typically those with a capacity of more than 30 seats or a maximum payload capacity of over 7,500 pounds.

Part 121 outlines the requirements for airworthiness, pilot qualifications, and operational safety, among other critical aspects to ensure the safe transportation of passengers and cargo. This includes detailed regulations concerning maintenance, inspections, and crew training, which are vital in maintaining high safety standards in commercial aviation.

In contrast, military aircraft operations, private pilot flights, and unmanned aerial vehicle operations are not governed by Part 121. Military operations follow specific military regulations, private pilots operate under Part 91, which addresses general aviation, and unmanned aerial vehicle operations are often subject to different regulations, including Parts 107 and 101, which cater to the unique nature of drone operations. This distinction reinforces the focus of Part 121 on commercial aviation that adheres to stringent safety and operational standards.