Which section of aviation regulation governs the privileges and limitations for air traffic controllers?

The correct answer is based on the fact that 14 CFR Part 65 specifically outlines the certification requirements, privileges, and limitations for air traffic controllers. This part of the Code of Federal Regulations details the qualifications necessary for an individual to be certified as an air traffic controller, as well as the operational restrictions that may apply. Understanding these regulations is crucial for ensuring that air traffic controllers are properly trained and legally allowed to perform their duties, which significantly impacts flight safety and efficiency in air traffic management.

The other choices pertain to different regulatory areas. For example, 14 CFR Part 91 governs general operating and flight rules applicable to the operation of aircraft. Part 121 primarily deals with the operations of scheduled air carriers in air transportation, while Part 107 focuses on the operation of small unmanned aircraft systems (UAS). Each of these parts addresses other aspects of aviation operation but does not specifically cover the privileges and limitations associated with the role of air traffic controllers.