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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“Between richer and poorer classes in a free country a mutually respecting antagonism is much healthier than pity on the one hand and dependence on the other, as is, perhaps, the next best thing to fraternal feeling.”
—Charles Horton Cooley (1864–1929)