The world`s navigable airspace is divided into three-dimensional segments, each of which is assigned to a specific class. Most nations adhere to the classification specified by the International Civil Aviation Organization (ICAO) and described below, though they might use only some of the classes defined below, and significantly alter the exact r....
Found on
http://en.wikipedia.org/wiki/Airspace_class
[United States] The United States airspace system`s classification scheme is to provide maximum pilot flexibility with acceptable levels of risk appropriate to the type of operation and traffic density within that class of airspace - in particular to provide separation and active control in areas of dense or high-speed flight operations. Th...
Found on
http://en.wikipedia.org/wiki/Airspace_class_(United_States)
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