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  2. Washington, D.C., Special Flight Rules Area - Wikipedia

    en.wikipedia.org/wiki/Washington,_D.C.,_Special...

    An air defense identification zone (ADIZ) has existed since February 10, 2003, [1] around the Baltimore-Washington Metropolitan Area to restrict air traffic near Washington, D.C. The ADIZ was established as a precursor to the US invasion of Iraq in 2003. [2] It has been erroneously connected to the September 11 attacks as a temporary measure to ...

  3. Airspace class (United States) - Wikipedia

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

    The core surface area has a radius of five nautical miles (9 km), and goes from the surface to the ceiling of the class C airspace. The upper "shelf" area has a radius of ten nautical miles, and extends from as low as 1,200 feet (370 m) up to the ceiling of the airspace.

  4. Airspace - Wikipedia

    en.wikipedia.org/wiki/Airspace

    Airspace. Airspace[1] is the portion of the atmosphere controlled by a country above its territory, including its territorial waters or, more generally, any specific three-dimensional portion of the atmosphere. [2] It is not the same as outer space which is the expanse or space outside the Earth and aerospace which is the general term for Earth ...

  5. Prohibited airspace - Wikipedia

    en.wikipedia.org/wiki/Prohibited_airspace

    Prohibited airspace. A prohibited airspace is an area (volume) of airspace within which flight of aircraft is not allowed, usually due to security concerns. It is one of many types of special use airspace designations and is depicted on aeronautical charts with the letter "P" followed by a serial number. It differs from restricted airspace in ...

  6. Flight information region - Wikipedia

    en.wikipedia.org/wiki/Flight_information_region

    In aviation, a flight information region (FIR) is a specified region of airspace in which a flight information service and an alerting service (ALRS) are provided. [1] The International Civil Aviation Organization (ICAO) delegates which country is responsible for the operational control of a given FIR. FIRs are the largest regular division of ...

  7. Line-of-sight propagation - Wikipedia

    en.wikipedia.org/wiki/Line-of-sight_propagation

    If the height h is given in feet, and the distance d in statute miles, d ≈ 1.23 ⋅ h {\displaystyle d\approx 1.23\cdot {\sqrt {h}}} R is the radius of the Earth, h is the height of the ground station, H is the height of the air station d is the line of sight distance

  8. Control zone - Wikipedia

    en.wikipedia.org/wiki/Control_zone

    Control zone. In aviation, a control zone (CTR) is a volume of controlled airspace, usually situated below a control area, normally around an airport, which extends from the surface to a specified upper limit, established to protect air traffic operating to and from that airport. Because CTRs are, by definition, controlled airspace, aircraft ...

  9. Kármán line - Wikipedia

    en.wikipedia.org/wiki/Kármán_line

    The Kármán line (or von Kármán line / vɒn ˈkɑːrmɑːn /) [2] is a conventional definition of the edge of space. It is not universally accepted. The international record-keeping body FAI (Fédération aéronautique internationale) defines the Kármán line at an altitude of 100 kilometres (54 nautical miles; 62 miles; 330,000 feet) above ...