Over Tomlinson Airport, which airspace structure correctly describes the area from the surface up to 1,200 ft AGL and from 1,200 ft AGL to 18,000 ft MSL?

• A. Class G from the surface to 1,200 ft AGL, and Class E from 1,200 ft AGL to 18,000 ft MSL
• B. Class E from the surface to 18,000 ft MSL
• C. Class B from the surface to 9,000 ft MSL
• D. Class D from the surface to 4,000 ft MSL

Answer: (A)

In US airspace, Class G is the uncontrolled airspace from the surface up to the base of the overlying controlled airspace, and around many airports that don’t have Class B, C, or D designated, the base of Class E starts at 1,200 feet AGL. So the surface up to 1,200 ft AGL being Class G, and then Class E from 1,200 ft AGL up to 18,000 ft MSL, fits the common layout. Above 18,000 ft MSL, Class A begins, which is not part of the question. The other options don’t match this typical structure: starting Class E at the surface would imply no Class G layer, Class B would indicate a surrounding around a major airport with special requirements, and Class D would describe a towered airport’s surface-to-4,000 ft AGL airspace, not the 1,200 ft transition described here.