The United States Government has exclusive sovereignty of airspace of the United States. A citizen of the United States has a public right of transit through the navigable airspace.
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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.
Vertical boundaryThere is no international agreement on the vertical extent of sovereign airspace, with suggestions ranging from about 30 km (19 mi)—the extent of the highest aircraft and balloons—to about 160 km (100 mi)—approximately the lowest extent of short-term stable orbits.
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.
The short answer is, no, it's not illegal to fly over Antarctica. But there are practical considerations that make it challenging for regular airlines to navigate across the land. In many parts of Antarctica, there's limited or no infrastructure, no landing strips, and obviously no refuelling stations for planes.
After the war. After pulling out of South Vietnam in 1975, there was an attempt to keep a company presence in Thailand; after this fell through, Air America officially disbanded on June 30, 1976, and was later purchased by Evergreen International Airlines, which continues to provide support for U.S. covert operations.
The normal flightpath crosses Scandinavia and then follows the north coast of Russia for around 2,000 miles before turning south and crossing Siberia and the Sea of Japan. It benefits from the prevailing jet stream, enabling it to average almost 550mph.