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Airspace class in the united states

overview about the airspace class in the United States

Pronunciation
/ˈɛrˌspeɪs klæs ɪn ðə juˈnaɪdəd steɪts/
/ˈɛːspeɪs klɑːs ɪn ðɪ juːˈnʌɪtɪd steɪts/