Which Federal Aviation Regulation section governs the certification of commercial pilots?

The certification of commercial pilots is governed by 14 CFR Part 61. This part specifically outlines the requirements for obtaining a pilot certificate, including the minimum flight hours, training, aeronautical knowledge, and practical test standards necessary for a commercial pilot rating.

Part 61 is crucial because it details not only the general certification requirements but also lays out the specifics for different types of pilot certificates, including private, commercial, and airline transport pilot certificates. The regulations are designed to ensure that pilots meet the necessary standards of proficiency and safety to operate commercial aircraft.

The other parts listed do not pertain to the certification of commercial pilots. Part 63 focuses on the requirements for the certification of flight crew members other than pilots, such as flight engineers and flight navigators. Part 65 governs the certification of airmen other than pilots, primarily concerning ground instructors and mechanics. Part 107 is specifically related to the operation of small unmanned aircraft systems (UAS) and their certification requirements. Therefore, the correct answer reflects the regulations directly pertaining to commercial pilot certification.