Which airspace begins at 700 or 1,200 feet AGL and extends to 17,999 feet MSL?

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

Answer: (A)

Class E is the controlled airspace that begins at 700 feet AGL or 1,200 feet AGL and extends up to 17,999 feet MSL, just below 18,000 feet where Class A begins. So the described range fits this pattern exactly: start at 700 or 1,200 AGL and top out at 17,999 MSL. Class G is uncontrolled up to the base of Class E, Class D is from the surface up to about 2,500 AGL around certain airports, and Class B surrounds certain busy airports with its own surface-to-high-altitude structure.