Vertical extent of Class G airspace

Remote Pilot (Part 107) practice question 9 of 21 on Airspace / Classification. ACS element UA.II.A.K1e · difficulty: recall. Want to answer it in a timed quiz? Use the Remote Pilot (Part 107) practice mode.

Question bank updated 2026-09-22

QUESTIONClass G airspace extends from the surface up to what limit?

A1,200 feet AGL in every location in the United States
B18,000 feet MSL, the floor of Class A airspace
CThe base of the overlying Class E airspace

Show the answer and explanation

Correct answer: C. The base of the overlying Class E airspace

A — incorrect The overlying Class E base is 1,200 feet AGL in most areas, but in many other areas it is the surface or 700 feet AGL, so the Class G top is not fixed.
B — incorrect 18,000 feet MSL is the typical upper limit of Class E; Class G ends much lower, at the base of the overlying Class E.
C — correct The study guide states that Class G airspace extends from the surface to the base of the overlying Class E airspace.

BACKGROUND

Uncontrolled airspace, or Class G airspace, is the portion of the airspace that has not been designated as Class A, B, C, D, or E. It extends from the surface to the base of the overlying Class E airspace. Because the Class E base varies by location (commonly 1,200 feet AGL, or the surface or 700 feet AGL in many areas), the top of Class G varies too. A remote pilot does not need ATC authorization to operate in Class G airspace.

STUDY TIP

Class G has no fixed ceiling of its own; its top is wherever the overlying Class E begins.

KEY POINTS

Class G is airspace not designated as Class A through E.
It runs from the surface to the base of the overlying Class E.
No ATC authorization is needed to operate in Class G.

SOURCES

remote_pilot_study_guide.txt Chapter 2 "Class G Airspace"

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