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  2. Airspace class (United States) - Wikipedia

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

    Class D airspace is generally cylindrical in form and normally extends from the surface to 2,500 feet (760 m) above the ground. Airspace within the given radius, but in surrounding class C or class B airspace, is excluded. Class D airspace reverts to class E or G during hours when the tower is closed, or under other special conditions. [9]

  3. Next Generation Air Transportation System - Wikipedia

    en.wikipedia.org/wiki/Next_Generation_Air...

    The need for NextGen became apparent during the summer of 2000 when air travel was impeded by severe congestion and costly delays. Two years later, the Commission on the Future of the U.S. Aerospace Industry recommended that a multi-agency task force develop an integrated plan to transform the U.S. air transportation system.

  4. National Airspace System - Wikipedia

    en.wikipedia.org/wiki/National_Airspace_System

    A side view of Class B airspace resembles an upside-down wedding cake with three layers becoming bigger toward the top. Class B's layers are designed individually to meet the needs of the airport they overlay. Pilots must also receive clearance to enter the Class B airspace but Visual Flight Rules may be used, unlike in Class A airspace. Class ...

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

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

    Drone activity caused officials to close airspace over one of the United States’ most critical Air Force bases for almost four hours late Friday and early Saturday, according to a base ...

  6. Drones over US show gaps in airspace security, top Trump ...

    www.aol.com/news/drones-over-us-show-gaps...

    A raft of drone sightings in New Jersey and other U.S. states has underscored gaps in U.S. airspace security that need to be closed, President-elect Donald Trump's pick for national security ...

  7. 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.

  8. Drones are buzzing around US military bases, even ... - AOL

    www.aol.com/news/drones-buzzing-around-us...

    A US military base in Ohio briefly closed its airspace heading into the weekend after small drones were spotted in the area, officials confirmed to Business Insider on Monday.

  9. Air Defense Identification Zone (North America) - Wikipedia

    en.wikipedia.org/wiki/Air_Defense_Identification...

    ADIZ boundaries for the United States and Canada as of 2018. ADIZ boundaries for Alaska. The Air Defense Identification Zone of North America is an air defense identification zone (ADIZ) that covers the airspace surrounding the United States and Canada – in which the ready identification, location, and control of civil aircraft over land or water is required in the interest of national ...