In which airspace does a VFR aircraft require ATC clearance to enter?

A VFR aircraft requires ATC clearance to enter Class B airspace due to the level of complexity and density of air traffic in this area. Class B airspace is typically found around the nation’s busiest airports and includes both a surface layer and extended vertical layers up to 10,000 feet. The requirement for ATC clearance ensures that the movement of VFR aircraft does not interfere with the high volume of IFR traffic that operates in this type of airspace, which can include large commercial airliners and busy general aviation traffic.

Furthermore, Class B airspace has strict operational procedures in place designed to maintain a high standard of safety and efficiency for all types of aircraft operating within or in close proximity to the area. Pilots must establish two-way radio communication with ATC before entering Class B airspace, which helps manage the traffic and provide necessary advisories.

In contrast, while Class C, Class D, and certain regions within Class E airspace also have their own operational requirements for VFR traffic, they do not necessitate an ATC clearance for entry. Pilots are generally required to communicate with ATC but not to have explicit clearance to enter these airspaces. Thus, the distinctive requirement for a clearance in Class B is a key factor