What is the term for the area of airspace designed for VFR flying?

The area of airspace designed for Visual Flight Rules (VFR) flying is typically associated with Class B airspace. This classification provides the greatest level of air traffic control service and is designed to ensure safe separation between aircraft flying under VFR and IFR (Instrument Flight Rules) operations. Class B airspace surrounds major airports where airspace congestion can be significant, and it permits VFR pilots to operate while benefiting from air traffic control services that help manage the high volume of traffic.

Class B airspace is specifically structured to allow for both safe and efficient VFR operations, providing pilots with a clear understanding of the air traffic environment. It requires pilots to maintain certain visibility and cloud clearance criteria, making it much more secure for flying visually compared to other airspace classes.

The other classifications such as Class A, C, and D airspace all have different requirements and may have specific limitations or operational rules that are less conducive to VFR flying, especially regarding altitude requirements and air traffic control interactions. Thus, Class B is the most appropriate designation for an area primarily designed to accommodate VFR flights.