(3) APPROACH TO THE DELIMITATION OF AIRSPACE AND OUTER SPACE (Union of Soviet Socialist Republics: working paper, A/AC.1005/C.2/L.139 of 4 April 1983) 1. The boundary between outer space and airspace shall be established by agreement among States at an altitude not exceeding 110 km above sea level, and shall be legally confirmed by the conclusion of an international legal instrument of a binding character. 2. This instrument shall also specify that a space object of any State shall retain the right of innocent (peaceful) passage over the territory of other States at altitudes lower than the agreed boundary for the purpose of reaching orbit or returning to Earth.