RELEVANT DISCUSSION:
FAR 71.61, 91.117, 91.129, 91.155, 103.17, 103.23, AIM 3-1-3, 3-1-4, 3-2-1, 3-2-5, 3-5-6, 4-3-2, 8-1-8, FAA-H-8083-15, 8083-16, 8083-25
1. Generally, Class D is controlled airspace from the surface to 2,500 feet agl (charted in msl rounded to the nearest 100 feet) surrounding an airport with an operating control tower (but often no radar). It is delineated with a dashed blue line surrounding the airport on VFR sectional and terminal charts and a boxed “D” in the airport information on IFR Enroute Low Altitude Charts. The ceiling is marked with a blue number (msl altitude in hundreds of feet) surrounded by blue brackets. Class D includes some of the busiest general aviation airports in the world.
2. It’s individually tailored, but normally a circular area with a radius of…