Technology / Aviation / Class D Airspace: Airspace around an airport with an operating control tower: typically to a radius of 5 miles and from the surface to 2,500 feet AGL. Radio contact with the control tower is required prior to entry.
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Class Verb Synonyms: classify, group, arrange, assort, type, categorize, rank, grade, rate, order
Class Noun Synonyms: rank, grade, level, order, stratum, caste, lineage, birth, pedigree, stock, extraction, descent
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Technology / Aviation / Controlled Airspace Class D: (formerly ATA - Airport Traffic Area and CZ - Control Zone) Generally, that airspace from the surface to 2,500' MSL above the airport elevation surrounding those airports that have an operational cont MORE
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