This industry comprises establishments primarily engaged in operating international, national and other civil airports. The activities involved in operating airports include renting hangar space, and providing air traffic control services, baggage handling, cargo handling and aircraft parking services. Public flying fields are included.

This industry comprises establishments, not classified to any other industry, primarily engaged in providing specialized services to the air transport industry. Some important activities are servicing aircraft, repairing and maintaining aircraft (except on a factory basis), and inspecting and testing aircraft.