Generally, that airspace from the surface to 2500 feet above the airport elevation (charted in MSL) surrounding airports that have an operational control tower. The configuration of each Class D airspace area is individually tailored, and when instrument procedures are published, the airspace will usually be designed to contain those procedures. During the hours the tower is not in operation, Class E surface area rules, or a combination of Class E rules to 700 feet AGL and Class G rules to the surface, will become applicable. Check the A/FD for specifics