Which airspace is found around smaller American airports, extending from the surface to 2,500 ft, and requires two-way radio communication to fly there?

• A. Class B Airspace
• B. Class D Airspace
• C. Class C Airspace
• D. Class E Airspace

Answer: (B)

Class D airspace surrounds smaller US airports that have a control tower. It extends from the surface up to 2,500 feet above the airport elevation and requires pilots to establish two-way radio communication with the tower before entering and while operating in the area. This two-way communication rule helps ATC manage traffic around an airport with a tower, keeping arrivals and departures coordinated within a relatively modest vertical span. It’s distinct from the other options: the larger, more complex airspaces around big airports have higher ceilings and additional requirements, while Class E often does not require such radio contact for basic VFR entry.