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

Class D airspace typically extends up to a radius of 4 nautical miles from the primary airport. This airspace classification is generally found around airports that have an operational control tower and is designed to protect aircraft operating in the vicinity of that airport during both arrival and departure operations. The 4 NM distance ensures that there is sufficient space for controlled traffic while still allowing for the safe and efficient movement of aircraft.

Understanding the dimensions of Class D airspace is important for pilots as it influences how they plan their approach and landing procedures, as well as how they communicate with air traffic control. This specific extent is a crucial aspect in maintaining safety and ensuring proper management of air traffic around the airport.