How far does Class D airspace typically extend from the primary airport?

Class D airspace typically extends 4 nautical miles from the primary airport. This type of airspace is designed to manage aircraft operations around airports that have an operational control tower. The 4 nautical mile radius allows for sufficient separation between arriving and departing aircraft while also accommodating the air traffic management needs of the surrounding area.

In Class D airspace, the control tower is responsible for maintaining safe distances between aircraft within this zone. The 4-mile distance is standard because it enables effective radar coverage and communication between pilots and air traffic controllers, ensuring safe and efficient air traffic flow.

This distance can vary based on specific airport requirements or operational considerations, but the standardization of 4 nautical miles helps pilots know what to expect when flying near controlled airports.