Air sovereignty

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Air sovereignty is the fundamental right of a sovereign state to regulate the use of its airspace and enforce its own aviation law - in extremis by the use of fighter aircraft.

Airspace above the land and sea areas of a state generally forms part of the sovereign state area. Flights by some civil aircraft into the airspace of a UN member state does not need prior permission (Convention on International Civil Aviation).

The upper limit of national airspace is not defined by law.