What type of air traffic control service is provided in Class A airspace?

In Class A airspace, the type of air traffic control service provided is an air traffic control service. This airspace extends from 18,000 feet mean sea level (MSL) up to and including flight level (FL) 600, where all aircraft are required to operate under instrument flight rules (IFR).

In this controlled airspace, air traffic controllers manage and separate IFR flights to ensure safety and efficient use of airspace. Because of the nature of Class A airspace, pilots must receive clearance from air traffic control before entering and must operate under strict adherence to ATC instructions. This service is essential for maintaining orderly traffic flow and minimizing the risk of mid-air collisions in a busy airspace environment.

While other airspace classes may offer advisory services or flight information services, these options do not apply in Class A where the focus is exclusively on the comprehensive and active air traffic control services provided to all aircraft operating within that space.