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The airspace around the busiest US airports is classified as ICAO Class B, and the primary airport (one or more) for which this airspace is designated is called Class B airport. As of August 2017, there are 37 Class B airports in the United States.What is restricted air space?
Restricted Air Space. Restricted Air Space is a questline from the Treehouse of Horror XXV Event that makes the Ray Gun purchasable.