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  2. Airspace class (United States) - Wikipedia

    en.wikipedia.org/wiki/Airspace_class_(United_States)

    The airspace class designation is in effect only during the hours of tower and approach operation at the primary airport; the airspace reverts to Class D if approach control is not operating, and to class E or G if the tower is closed. The vertical boundary is usually 4,000 feet (1,200 m) above the airport surface. The core surface area has a ...

  3. Airspace class - Wikipedia

    en.wikipedia.org/wiki/Airspace_class

    Class C airspace is used around airports with a moderate traffic level. Class D is used for smaller airports that have a control tower. The U.S. uses a modified version of the ICAO class C and D airspace, where only radio contact with ATC rather than an ATC clearance is required for VFR operations.

  4. National Airspace System - Wikipedia

    en.wikipedia.org/wiki/National_Airspace_System

    Class E airspace is the airspace that lies between Classes A, B, C, and D. Class E extends from either the surface or the roof of the underlying airspace and ends at the floor of the controlled airspace above. Class E exists for those planes transitioning from the terminal to en route state.

  5. List of Class D airports in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_Class_D_airports...

    Class D is a class of airspace in the United States which follows International Civil Aviation Organization (ICAO) air space designation. Class D airspace areas are designed to improve aviation safety by reducing the risk of mid-air collisions with a control tower. [ 1 ]

  6. Terminal control area - Wikipedia

    en.wikipedia.org/wiki/Terminal_control_area

    In Canada, the TCA is normally designated as class B, C or D. [5] In the U.S., the airspace of a TCA is typically designated as class B. In the U.K., the airspace of a TMA is usually designated as class A, D or E. In Australia and New Zealand, "terminal airspace" is not used both in common vernacular or publication and legislation. However, the ...

  7. Terminal radar service area - Wikipedia

    en.wikipedia.org/wiki/Terminal_radar_service_area

    In United States aviation, a terminal radar service area (TRSA) is a delimited airspace where radar and air traffic control services are made available to pilots flying under instrument flight rules or (optionally) visual flight rules, to maintain aircraft separation. TRSAs most often surround busy U.S. airports.

  8. Key US Air Force base closes airspace amid drone sightings - AOL

    www.aol.com/news/key-us-air-force-closes...

    The controller can be heard in the audio, which the outlet said was shared by a reader, saying security forces are handling the situation and tells the flight that the base’s class D airspace ...

  9. Airspace - Wikipedia

    en.wikipedia.org/wiki/Airspace

    If the airspace is not Class A, B, C, or D, and is controlled airspace, then it is Class E airspace. Class E airspace extends upward from either the surface or a designated altitude to the overlying or adjacent controlled airspace. When designated as a surface area, the airspace is configured to contain all instrument procedures.