Class D Airspace is a type of controlled airspace that typically surrounds airports with an operational control tower. It extends from the surface up to a specified altitude, usually 2,500 feet above ground level. Pilots must communicate with air traffic control (ATC) when flying in this airspace to ensure safe operations and avoid collisions. To enter Class D Airspace, pilots need to establish two-way radio communication with the ATC facility managing that airspace. This helps maintain an organized flow of air traffic, especially during busy times. Visual flight rules (VFR) pilots must also adhere to specific weather minimums when operating in this area.