CTA — Controlled Time of Arrival. CTA — Control Area. CTA/FIR — Control Area/Flight Information Region.
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The airport zones are established around the airports to provide efficient the aircraft landings, ground movements, and taking-offs. The terminal airspace is established around large airports with substantive traffic.
Class Delta (also referred to as Class D) Airspace areas established around airports that have an Air Traffic Control Tower but do not provide radar services. Containing an Air Traffic Control Tower, Class D airspace areas provide services to pilots.