Hello! A country has complete and exclusive sovereignty over the whole space above its territory. This is airspace sovereignty. After the end of World War I, the first international aviation code, the Aviation Management Convention, was concluded at the Paris Peace Conference in 19 19. Article 1 stipulates: "Contracting States recognize that each country has complete and exclusive sovereignty over the airspace above its territory." 1944 Chicago convention on international civil aviation also makes the same provision in article 1. The words "recognized by the contracting state" used at the beginning of this article indicate that the contents of the declaration belong to the rules of customary international law, that is, they are equally legally binding on non-contracting States. In this way, the territorial land, territorial sea and airspace constitute the three-dimensional scope of a country's territory. There are five or six opinions about the vertical boundary of airspace, that is, the upward extension height of airspace, or the boundary between airspace and outer space. Among them, the opinion that the highest line of air flight (about 32-40km from the Earth) and the lowest line of satellite orbit (100-10km) are influenced by the gravity of the Earth is even more aroused. Generally speaking, it is more convincing that the orbit distance of artificial satellite from the earth100-10 km, whether based on the function of aircraft or the physical performance of space. Since this division has no serious impact on the actual operation of air law and outer space law, the international community is in no hurry to draw conclusions. "Complete and exclusive sovereignty" does not mean the supreme power that a country can unilaterally and arbitrarily handle. It must at least be bound by the rules of customary international law and the international conventions to which the country is a party. From the discussion of recent history, in view of several incidents in which foreign civil aviation planes were shot down due to yaw flying into a country's territory, especially the serious incident in which 1983 South Korea flight KE007 flew over Vladivostok in the former Soviet Union and was shot down by the Soviet side, resulting in the death of 269 passengers on board, it triggered a discussion on whether it is customary to prohibit the use of force against civil aviation planes in flight. 1944 Article 3 of Chicago Convention1944 adopted by the 25th (special) General Assembly of the International Civil Aviation Organization (ICAO) in April 1984 stipulates: "Contracting States recognize that all countries must exercise restraint when using weapons against civil aircraft in flight, and must not endanger the lives of people on board and the safety of the aircraft." It is generally believed that judging from the wording "recognized by the contracting States" used in this article, it declares a rule of customary international law that is binding on all countries. Thanks for reading!