What is the upper limit of the Class E airspace that extends upward from the surface from 1,200 feet AGL?

What is the upper limit of the Class E airspace that extends upward from the surface from 1,200 feet AGL?

• A. 17,999 feet MSL
• B. 18,500 feet MSL
• C. 19,000 feet MSL
• D. 12,000 feet MSL

Answer: (A)

Class E that starts at 1,200 feet AGL runs upward to the boundary where Class A begins, which is at 18,000 feet MSL. Since the ceiling is “to, but not including, 18,000 feet,” the highest altitude still inside that Class E is 17,999 feet MSL. The 18,000 feet MSL mark is the transition to Class A, so anything at or above that is not in this Class E. The other options either imply reaching the Class A boundary or are outside the defined ceiling.

Class E that starts at 1,200 feet AGL runs upward to the boundary where Class A begins, which is at 18,000 feet MSL. Since the ceiling is “to, but not including, 18,000 feet,” the highest altitude still inside that Class E is 17,999 feet MSL. The 18,000 feet MSL mark is the transition to Class A, so anything at or above that is not in this Class E. The other options either imply reaching the Class A boundary or are outside the defined ceiling.