How does Class A airspace differ from Class B airspace?

Class A airspace is designated primarily for Instrument Flight Rules (IFR) traffic, meaning all aircraft operating within this airspace must be under IFR, regardless of whether they are commercial or private. This airspace extends from 18,000 feet MSL up to and including FL600 (60,000 feet) and is designed to ensure that all operations are coordinated by an Air Traffic Control (ATC) facility. The requirement for IFR clearance in Class A airspace is vital for maintaining safe separation between aircraft in a high-density area, particularly given that this airspace often overlaps significant air routes.

In contrast, Class B airspace is primarily established around busy airports to manage traffic in a terminal environment. It can accommodate both IFR and Visual Flight Rules (VFR) flights, although VFR aircraft must receive specific clearance to enter this airspace. Class B airspace is designed to provide a safe and orderly flow of air traffic in areas where there is a high volume of flights both departing and arriving.

Understanding the distinctions between the two classes helps pilots plan their flights effectively and maintain compliance with regulations, significantly enhancing aviation safety.