What outlines the lateral limits of Class B airspace on a Sectional Chart?

Class B airspace is depicted on Sectional Charts using concentric solid blue circular lines. These lines represent the lateral boundaries of Class B airspace, which typically surrounds major airports to manage and control air traffic. The solid blue color indicates that this airspace has specific requirements for aircraft operating within it, including the need for both a specific pilot certificate and air traffic control clearance.

The use of concentric circles signifies the tiers of airspace that exist at various altitudes above the airport. Within this airspace, additional rules and regulations apply to ensure safety in the busy environments that Class B airspace typically encompasses. Understanding this depiction is crucial for pilots to navigate safely within or around controlled airport surroundings.