What is the altitude limit for Class A airspace?

Class A airspace is defined by the regulations governing aeronautical operations, specifically the Federal Aviation Administration (FAA) rules in the United States. This type of airspace is generally found between 18,000 feet Mean Sea Level (MSL) and 60,000 feet MSL.

The purpose of Class A airspace is to provide a structured environment for high-altitude aircraft, particularly those operating under Instrument Flight Rules (IFR). Pilots operating in this airspace must have an instrument rating and their aircraft must be equipped accordingly. This airspace is designed to ensure that all aircraft are operating under stringent air traffic control (ATC) supervision, thus enhancing safety and efficiency in the busy skies at higher altitudes.

Other options list altitudes that do not accurately reflect the boundaries of Class A airspace:

• For example, altitudes beginning at 10,000 feet or 15,000 feet do not align with the Class A minimum threshold, which starts at 18,000 feet.

• The upper limit of 60,000 feet is established to accommodate high-speed jet traffic and is part of the overall structure for air traffic management.

Understanding the designated altitudes for Class A airspace is crucial for pilots to ensure