Which of the following is NOT a duty of the airport operations staff?

The correct answer identifies air traffic control services as a duty that is not typically assigned to airport operations staff. Air traffic control functions are specifically carried out by air traffic controllers, who are responsible for managing the safe and orderly flow of air traffic in the airspace and on the ground at airports. Their role involves providing instructions and information to pilots regarding takeoff, landing, and taxiing, which is distinct from the broader airport operations functions.

In contrast, the remaining responsibilities pertain to the operational aspects of managing an airport. Airport operations staff oversee security operations to ensure compliance with safety regulations, manage flight schedules to facilitate the efficient movement of aircraft, and coordinate ground handling services to support the arrival and departure of flights. Each of these roles contributes to the seamless functioning of airport activities but does not include the direct management of air traffic, which is a specialized function requiring different training and certification.