What defines the altitude of Class D airspace?

Class D airspace typically extends from the surface up to 2,500 feet above mean sea level (MSL). This designation is established to provide controlled airspace surrounding airports with an operational control tower, enhancing safety for both arriving and departing aircraft within that vicinity. The altitude limits ensure that air traffic control can manage the flow of air traffic and maintain safe separation from other aircraft.

The lower limit of Class D airspace is at the ground level, which allows for takeoffs and landings at the associated airport. The upper limit of 2,500 feet MSL is specifically tailored to suit the typical altitude below which control is necessary, as most general aviation operations and many approaches occur within this range. Understanding this altitude range is essential for pilots operating in or near Class D airspace to ensure compliance with airspace requirements and effective communication with air traffic controllers.