What is a key characteristic of Class B airspace?

A key characteristic of Class B airspace is that it requires a high level of communication with air traffic control. This airspace is typically found around major airports where high-density traffic is present. To operate in Class B airspace, pilots must establish two-way radio communication with air traffic controllers, who provide clearances and instructions to maintain safety and manage the flow of air traffic effectively.

This requirement is crucial because Class B airspace often includes multiple levels of altitude that can be crowded by various types of aircraft, including commercial airliners, general aviation, and cargo flights. Thus, effective communication is essential to avoid conflicts and ensure that all pilots are aware of each other's positions and intentions.

The other aspects of Class B airspace do not align with its primary characteristics; it does impose restrictions, especially for VFR pilots, who must meet specific requirements to enter. It is controlled airspace, meaning all operations must be coordinated with ATC, and it does not provide unlimited altitude as there are established vertical limits for aircraft operating within this airspace.