How high can Class B airspace extend?

Class B airspace is designed to protect air traffic around the busiest airports, where there is a high concentration of aircraft. Generally, Class B airspace extends from the surface up to 10,000 feet Mean Sea Level (MSL). This range is established to accommodate the various types of operations, including both commercial airline traffic and general aviation.

The layered structure of Class B airspace often resembles an inverted wedding cake, with each layer extending higher as you move away from the airport. The 10,000 feet MSL limit is crucial for ensuring that aircraft can operate safely beneath the generally busy altitude used by commercial airliners while still allowing for sufficient vertical separation.

While it is important to note that Class B airspace can vary in its design from one airport to another, the typical upper limit of 10,000 feet MSL effectively manages the complexity and volume of air traffic in these heavily trafficked areas.