Airspace Classes
In the U.S. airspace is categorized as regulatory (controlled) - Classes A, B, C, D, and E - and nonregulatory (uncontrolled) - Class G - based on which air traffic control service is provided to IFR flights and some VFR flights. Class F is not used in the U.S. (Aeronautical Information Manual 3-1-1.a) Besides controlled and uncontrolled airspace, "types" of airspace include Special Use and Other Airspace. (AIM 3-1-1.b)
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—Henry David Thoreau (1817–1862)