What is the upper limit of Class C airspace?

The upper limit of Class C airspace is established as 4,000 feet above the airport elevation. Class C airspace typically extends from the surface up to 4,000 feet above the airport elevation, creating a zone that facilitates the operation of both the airport's traffic and its surrounding airspace. This structure is designed to ensure that aircraft operating in and near busy airports have the necessary separation and communication to maintain safety.

While Class C airspace does not extend higher than that specific limit, it is important to note that the airspace surrounding an airport can vary in configuration and altitude, often tailored to accommodate the needs of the airport itself and the traffic patterns in that area. Other classes of airspace, such as Class A, which begins at 18,000 feet MSL, have distinctly different upper limits and operational requirements.