Which airports are subject to Part 139?

• A. Part 139 applies to Classes I - IV airports
• B. Part 139 applies to Class II airports only
• C. Part 139 applies to all airports regardless of class
• D. Part 139 applies to Class IV airports only

Answer: (A)

Part 139 applies to airports that host scheduled air carrier operations, and those airports are grouped into four classes (Classification I through IV) based on size and traffic. Because all four classes cover airports that handle air carrier service, Part 139 certification applies to Class I, II, III, and IV airports. Smaller general aviation airports that do not serve air carriers aren’t required to obtain Part 139 certification, which is why the correct concept is that Part 139 applies to the four classes of airports that handle air carrier operations.