What is the service operated by the appropriate authority to promote a safe, orderly, and expeditious flow of aircraft?

• A. Air Traffic Control (ATC)
• B. Airport Security
• C. Meteorological Service
• D. Flight Information Center

Answer: (A)

Air traffic control is the service operated by the appropriate authority to promote a safe, orderly, and expeditious flow of aircraft. Controllers coordinate and direct aircraft on the ground and in the air, issuing clearances for takeoff, routing, altitude, and sequencing for arrivals and departures to maintain safe separation and efficient movement. Different control facilities handle different parts of the flow: towers manage ground and local airspace around airports, approach/departure control sequences arrivals and departures, and en route centers handle high-altitude traffic. The other options serve important roles—airport security protects facilities, meteorological service provides weather information, and flight information centers offer advisory data—but they do not control and manage the overall traffic flow.