Controlled Airspace is a generic term which covers ATS airspace classes A, B, C, D, & E. Controlled Airspace includes Control Areas, Terminal Control Areas, Airways and Control Zones.

What class of airspace is controlled?

Controlled Airspace: Class A, B, C, D and E

There are five different classes of controlled airspace: A, B, C, D, and E airspace. A pilot requires clearance from ATC prior to entering Class A and B airspace, and two-way ATC communications are required before flying into Class C or D airspace.

Is Class G airspace controlled?

Class G airspace includes all airspace below 14,500 feet (4,400 m) MSL not otherwise classified as controlled. There are no entry or clearance requirements for class G airspace, even for IFR operations. ... Radio communication is not required in class G airspace, even for IFR operations. Class G is completely uncontrolled.