What is required to enter Class A airspace?

To enter Class A airspace, the requirement is an instrument rating. Class A airspace is generally located between 18,000 feet and 60,000 feet mean sea level (MSL) and is primarily used for high-altitude instrument flight operations. In this airspace, all aircraft must operate under instrument flight rules (IFR), which necessitates that the pilot holds an instrument rating. This rating ensures that the pilot is trained and competent in navigating and controlling an aircraft solely by reference to instruments, which is essential in the complex and regulated environment of Class A airspace.

While having a valid pilot certificate and appropriate clearances is important for flying in any airspace, the unique requirement of an instrument rating specifically addresses the IFR conditions that govern Class A airspace, making it the key factor for entry.