Final answer:
Class VII Combined Center and Radar Approach Control Facilities provide control service to aircraft, specifically for the approach and departure phases of flight near airports.
Step-by-step explanation:
The Class VII Combined Center and Radar Approach Control Facilities provide control service to aircraft. These facilities are responsible for ensuring the safe and efficient flow of air traffic by providing radar services to aircraft operating in the vicinity of airports. They handle the approach and departure of aircraft, assist with en route traffic as needed, and ensure that planes maintain safe distances from each other. The services they offer significantly contribute to the orderly and expeditious flow of air traffic, particularly during the critical phases of flight such as takeoff, landing, and when flying through controlled airspace. It's important to note that these facilities do not provide en route radar service for the duration of the flight, advisory service to pilots, or maintenance service for facilities; their primary focus is on the approach and departure segments of flights.