What is the function of a control tower at an airport?

The function of a control tower at an airport is essential for ensuring the safety and efficiency of air traffic. A control tower is responsible for directing aircraft operations on the runways and in the airspace surrounding the airport. Tower controllers coordinate the takeoff and landing sequences, manage the flow of air traffic, and ensure that aircraft are spaced safely apart to avoid collisions. They provide real-time instructions to pilots and communicate important information regarding weather conditions, runway availability, and other critical factors to maintain operational safety.

The other options do not accurately describe the primary responsibilities of a control tower. Mechanical support is provided by ground services and not by the control tower. Meal service and ticketing are tasks handled by airlines and airport staff rather than by the air traffic control system.