Which airspace is considered uncontrolled?

• A. Class G
• B. Class E
• C. Class C
• D. Class B

Answer: (A)

Uncontrolled airspace means airspace where you won’t receive air traffic control services or separation from ATC. In the U.S. system this is Class G. It typically lies beneath the base of the controlled airspace above it (usually beneath the base of Class E) and has no mandatory ATC clearance requirements for VFR pilots. That lack of required ATC intervention is what makes it uncontrolled.

The other airspace classes (the ones above) are all considered controlled and involve some level of ATC service, with varying entry and clearance requirements. So, the best answer identifies Class G as the airspace that does not have ATC control or mandated separation.