Where does U.S. airspace end?

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.



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It houses the president of the United States and his administration along with highly protected national intelligence. In fact, ever since the 9/11 terrorist attacks, the entire DC area is considered National Defense Airspace (NDA) and is the most restricted airspace in the country.

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Federal law provides that the United States government has exclusive sovereignty of airspace of the United States; the FAA makes the plans and policy for the use of the navigable airspace; and any citizen has a public right of transit through the navigable airspace. 49 U.S. Code § 40103.

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U.S. Congress has vested the Federal Aviation Administration (FAA) with authority to regulate the areas of airspace use, management and efficiency, air traffic control, safety, navigational facilities, and aircraft noise at its source. 49 U.S.C.

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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.

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