Which class of airspace typically surrounds the control tower at a regional airport?

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Class D airspace is the environment around airports that have an operating control tower and actively manage traffic there. Pilots must establish two-way radio communication with the tower before entering and while operating inside this airspace. It typically extends from the surface up to 2,500 feet above the airport elevation, within about a 4 nautical mile radius. Regional airports with towers fit this pattern, offering controlled airspace to coordinate movements without the higher levels of control used at larger airports. This is different from Class A, which starts at 18,000 feet MSL and is for high-altitude en route operations; Class B and Class C surround busier airports with more complex radar services; and Class E is controlled airspace that isn’t tied to a tower and can start at various altitudes or at the surface in other locations.