The vertical limits of that portion of Class E airspace designated as a Federal Airway over Magee Airport are

• A. 1,200 feet AGL to 17,999 feet MSL
• B. Surface to 5,000 feet MSL
• C. 700 feet AGL to 18,000 feet MSL
• D. 3,000 feet AGL to 20,000 feet MSL

Answer: (A)

Federal airways, which are corridors of Class E airspace IFR traffic uses, have a standard vertical span that starts at 1,200 feet AGL and extends up to 17,999 feet MSL. This keeps IFR flights within controlled airspace while the ceiling stops just short of 18,000 feet MSL, where Class A begins. Over Magee Airport, that means the airway portion’s vertical limits are from 1,200 feet AGL up to 17,999 feet MSL.

Lower limits at the surface describe a different kind of area (E to the surface), while floors like 700 or 3,000 feet AGL correspond to other Class E configurations such as transition areas, not the standard Federal airway. A top at 20,000 feet would exceed the Class A boundary.