The federal government has exclusive sovereignty of U.S. airspace. Congress delegated to the FAA the ability to define “navigable airspace” and the authority to regulate “navigable airspace” of aircraft by regulation or order.
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The Federal Aviation Administration (FAA) of the United States provides air traffic control services over U.S. territory and over international waters where it has been delegated such authority by the International Civil Aviation Organization.
For the most part, compliance with the 400-foot rule is a voluntary matter. There is no existing mechanism for the FAA to monitor if there are drone pilots, licensed or otherwise, who will fly above this altitude limit.
The FAA is a year-round, 24/7 operation, responsible for 5.3 million square miles of U.S. domestic airspace and 24 million square miles of U.S. airspace over the oceans.
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.
The busiest airport in the United States is Atlanta's Hartsfield-Jackson International Airport (ATL). The Atlanta airport is also the No. 1 busiest airport in the world. In 2022, 45.4 million passengers boarded commercial aircraft in Atlanta, according to the FAA.