Which air traffic control function is primarily responsible for assisting aircraft during the final phases of landing?

The function primarily responsible for assisting aircraft during the final phases of landing is Approach control. This service is crucial as it guides an aircraft from the en-route phase closer to the airport, ensuring that it follows the proper descent profile and maintains the necessary separation from other aircraft. Approach control uses radar and other navigational aids to monitor and manage the airspace, providing instructions for altitude changes, speed adjustments, and heading corrections as the aircraft prepares to land.

As aircraft transition from the en-route phase to landing, Approach control plays a vital role in sequencing arrivals to ensure efficient landings while minimizing the risk of collisions. This coordination helps maintain safe distances between aircraft and provides a smooth approach to the airport, allowing pilots to focus on executing their landing procedures.