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  2. Airspace class (United States) - Wikipedia

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

    Class E airspace is denoted in different ways depending on its lower altitude limit. Airspace in this class that begins at the default altitude of 14,500 feet (4,420 m) MSL is not delimited. Class E airspace that begins at 700 feet (210 m) AGL is delimited by a broad, shaded magenta border.

  3. Airspace class - Wikipedia

    en.wikipedia.org/wiki/Airspace_class

    Federal airways from 1,200 ft (370 m) AGL to 18,000 ft (5,500 m) MSL within 4 miles (6 km) of the centerline of the airway is designated Class E airspace. Airspace at any altitude over FL600 (60,000 ft; 18,300 m) (the ceiling of Class A airspace) is designated Class E airspace. [18] The U.S. does not use ICAO Class F.

  4. List of Class C airports in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_Class_C_airports...

    The innermost ring with a radius of 5 nautical miles (9 km) typically extends from the surface area around the airport to 4,000 feet (1,220 m) AGL (above ground level; charted in MSL), and an outer ring, with a radius of 10 nautical miles (19 km) that typically surrounds the inner ring and extends from a floor at 1,200 feet (370 m) AGL, (also ...

  5. National Airspace System - Wikipedia

    en.wikipedia.org/wiki/National_Airspace_System

    Download QR code; Print/export ... 60,000 ft. MSL. It is the most controlled airspace and requires a ... up to 1,200 ft AGL. At 1,200 ft. the airspace extends to 10 ...

  6. Airspace - Wikipedia

    en.wikipedia.org/wiki/Airspace

    Class A airspace is generally the airspace from 18,000 feet (~3.4 miles, 5.5 km) mean sea level (MSL) up to and including flight level (FL) 600 (~11.4 miles, 18.3 km), including the airspace overlying the waters within 12 nautical miles (NM) (~13.8 miles, 22.2 km) of the coast of the 48 contiguous states and Alaska. Unless otherwise authorized ...

  7. List of transponder codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Transponder_Codes

    VFR flight above 10,000' MSL when no other code has been assigned. [citation needed] US: External ARTCC subset. (Block of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.) [3] 1500 US: Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2.

  8. Flight level - Wikipedia

    en.wikipedia.org/wiki/Flight_level

    The transition layer is the airspace between the transition altitude and the transition level. According to these definitions the transition layer is 0–500 feet (0–150 m) thick. Aircraft are not normally assigned to fly at the "'transition level'" as this would provide inadequate separation from traffic flying on QNH at the transition altitude.

  9. Visual meteorological conditions - Wikipedia

    en.wikipedia.org/wiki/Visual_meteorological...

    For instance, in Australia, VMC minima outside controlled airspace are clear of cloud with 5,000 m visibility below 3,000 ft AMSL or 1,000 ft AGL (whichever is higher), and 1,000 ft vertical/1,500 m horizontal separation from cloud above these altitudes or in controlled airspace. Above 10,000 ft, 8,000 m visibility is required to maintain VMC.