Class B Airspace

Learning Objectives

At the end of this lesson, you will be able to:

  • Describe the general shape and characteristics of Class B airspace.
  • Find Class B airspace on a sectional chart.
  • Determine the boundaries, including the floor and ceiling of each ring, of Class B airspace.


Class B airspace exists at the 37 busiest airports in the United States.  It is shaped like an upside-down wedding cake.

Generally, Class B airspace is that airspace from the surface to 10,000 feet MSL surrounding the nation’s busiest airports in terms of IFR operations or passenger enplanements.  The configuration of each Class B airspace area is individually tailored and consists of a surface area and two or more layers.

AIM 2-3-2

Class B airspace is shown on VFR sectional charts as concentric rings of solid blue lines.  The floor and ceiling of each ring is printed on the sectional chart in hundreds of feet MSL.

Complete and Continue