What is the altitude to which the inner ring of Class C airspace extends?

The inner ring of Class C airspace typically extends from the surface up to 4,000 feet above ground level (AGL). Class C airspace is designed to manage and separate air traffic in busy terminal areas, and the inner ring is the most critical part of this airspace.

The vertical limits help create a controlled environment where both arriving and departing aircraft can operate safely. The 4,000 feet AGL limit allows for enough vertical separation from the surrounding airspace while providing sufficient space for general and commercial aviation operations. Understanding these specific altitudes is essential for pilots to ensure compliance with airspace regulations and to maintain safe operations within congested areas.