Class A Airspace

Generally that airspace from 18,000ft MSL up to and including FL600, including the airspace overlying the waters within 12 nautical miles of the coast of the 48 contiguous States and Alaska; and designated international airspace beyond 12 nautical miles of the coast of the 48 contiguous States and Alaska within areas of domestic radio navigational signal or ATC radar coverage, and within which domestic procedures are applied.  

Unless otherwise authorized, all persons must operate their aircraft under IFR.

Unlike other forms of airspace, Class A is not marked on VFR sectionals or IFR enroute charts.

Sources: FAA, Bold Method

March 19, 2019 by Kyle Boas