If ATC isn't available, the airspace still remains controlled airspace. (in most cases). Some airspace does change classes, such as D to E. Some airspace reverts to G.
In the case of the activities in the southern republik of Kalifornia, center took over, but with limited functions. It was more like operating in a non radar environment.
In the case of the activities in the southern republik of Kalifornia, center took over, but with limited functions. It was more like operating in a non radar environment.