Aeronautics and space. Part71:Designation of class a,b,c,d,and e airspace areas,air traffic service routes,and reporting points. SubpartA:Class a airspace. Section71.33:Class a airspace areas.
(a) That airspace of the United States, including that airspace overlying the waters within 12 nautical miles of the coast of the 48 contiguous States, from 18,000 feet MSL to and including FL600 excluding the states of Alaska and Hawaii, Santa Barbara Island, Farallon Island, and the airspace south of latitude 25°04′00″？North.