The ownership and jurisdiction of airspace above FL600 (60,000 feet) are governed by a combination of national sovereignty and international treaty. According to the Chicago Convention, every nation has "complete and exclusive sovereignty over the airspace above its territory." However, in the United States, the FAA generally classifies airspace above FL600 as Class E (Uncontrolled) for the purpose of standard air traffic control, as very few commercial or civilian aircraft operate at those extreme altitudes. This is essentially the "fringe" of navigable airspace. Beyond the limits where traditional aircraft can fly—a boundary often cited as the Kármán Line (approximately 100 km or 330,000 feet)—national sovereignty theoretically ends and "Outer Space" begins. Under the 1967 Outer Space Treaty, no nation can claim sovereignty over space or celestial bodies. Therefore, while a country owns the air directly above it up to the point where space begins, the region above FL600 is largely unregulated for transit, though any vehicle passing through it (such as a rocket or a high-altitude balloon) is still subject to the laws of the country in which it is registered.