Title 14 of the Code of Federal Regulations (14 CFR) includes the federal aviation regulations governing:

• A. International Aviation Treaties
• B. Airport Funding Guidelines
• C. Aircraft Maintenance Scheduling
• D. The operation of aircraft, airways, and airmen

Answer: (D)

14 CFR is the body of Federal Aviation Regulations that governs aviation activities in the United States. It sets the rules for how aircraft are operated, how airways and airspace are used, and who may operate or maintain the aircraft—covering pilots, air traffic controllers, mechanics, and other airmen. This broad scope is why it’s the primary source for day-to-day flight operations and safety standards. International treaties influence aviation law but they aren’t the specific flight rules pilots follow; airport funding guidelines concern financing rather than flight operations; and maintenance scheduling is included within the regulatory framework, but the overarching focus of 14 CFR is the operation of aircraft, airways, and airmen.