Aeronautics and space. Part71:Designation of class a,b,c,d,and e airspace areas,air traffic service routes,and reporting points. SubpartD:Class d airspace. Section71.61:Class d airspace.
The Class D airspace areas listed in subpart D of FAA Order 7400.9Y (incorporated by reference, see § 71.1) consist of specified airspace within which all aircraft operators are subject to operating rules and equipment requirements specified in part 91 of this chapter. Each Class D airspace area designated for an airport in subpart D of FAA Order 7400.9Y (incorporated by reference, see § 71.1) contains at least one primary airport around which the airspace is designated.