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Reference.org
National Airspace System
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<p>The National Airspace System (NAS) is the <a href="/facts/Airspace/6FbRBRSu">airspace</a>, navigation facilities and <a href="/facts/Airport/KQkDpK1n">airports</a> of the <a href="/facts/United_States/P0sCdLe5">United States</a> along with their associated information, services, rules, regulations, policies, procedures, personnel and equipment. It includes components shared jointly with the military. It is one of the most complex aviation systems in the world, and services air travel in the United States and over large portions of the world's oceans. </p>