I think they’re called, airport codes? But, how do airports determine what theirs is? It seems like there isn’t an clear pattern to different airports abbreviations. (EX: Denver’s airport code is DEN, San Francisco’s is SFO, Baltimore’s is BWI)
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Some airports change name. If their name lends itself to 3 letters, and it isn’t taken, then good. BWI is Baltimore Washington International. O’Hare is ORD because long ago it was Orchard Field.
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