Class D Airspace

Controlled airspace surrounding airports with an operating control tower but without radar approach control. Shown as dashed blue lines on sectional charts, it typically extends from the surface to 2,500 feet AGL. Pilots must establish two-way radio communication with the tower before entering. VFR weather minimums are 3 SM visibility, 500 below, 1,000 above, and 2,000 horizontal from clouds. When the tower closes, the airspace usually reverts to Class E or G.