San Francisco Ballet "Mr. Tomasson has accomplished the unprecedented: He has pulled a so-called regional company into the national ranks, and he has done so by honing the dancers into a classical style of astonishing verve and purity. San Francisco Ballet under Helgi Tomasson's leadership is one of the spectacular success stories of the arts in America." In May 1995, San Francisco Ballet hosted 12 ballet companies from around the world for UNited We Dance: An International Festival. The festival commemorated the 50th anniversary of the signing of the United Nations Charter, which took place at the San Francisco War Memorial and Performing
International Civil Aviation Organization convention, held in London in 1912 allocated the first radio callsigns for use by aircraft. ICAN continued to operate until 1945. Fifty-two countries signed the Chicago Convention on International Civil Aviation, also known as the Chicago Convention, in Chicago, Illinois, on 7 December 1944. Under its terms, a Provisional International Civil Aviation Organization (PICAO) was to be established, to be replaced in turn by a permanent organization when 26 countries ratified the convention. Accordingly, PICAO began operating on 6 June 1945, replacing ICAN. The 26th country ratified the Convention on 5 March 1947 and, consequently PICAO was disestablished on 4