Antonov State Enterprise (), formerly the Aeronautical Scientific-Technical Complex named after Antonov (Antonov ASTC) (), and earlier the Antonov Design Bureau, for its chief designer, Oleg Antonov, is a Ukrainian aircraft manufacturing and services company. Antonov's particular expertise is in the fields of very large aeroplanes and aeroplanes using unprepared runways. Antonov (model prefix "An-") has built a total of approximately 22,000 aircraft, and thousands of its planes are operating in the former Soviet Union and in developing countries. Antonov StC is a state-owned commercial company. Its headquarters and main industrial grounds were originally located in Novosibirsk, and in 1952 were transferred to Kyiv. On 12 May 2015 it was transferred from the Ministry of Economic Development and Trade to the Ukroboronprom (Ukrainian Defense Industry). In June 2016, Ukraine's major state-owned arms manufacturer Ukroboronprom announced the creation of the Ukrainian Aircraft Corporation within its structure, to combine all aircraft manufacturing enterprises in Ukraine. History Soviet era Foundation and relocation The company was established in 1946 at the Novosibirsk Aircraft Production Association as the top-secret Soviet Research and Design Bureau No. 153 (OKB-153). It was headed by Oleg Antonov and specialised in turboprop military transport aircraft. The task was to create an agricultural aircraft CX-1 (An-2), the first flight of which occurred on August 31, 1947. The An-2 biplane was a major achievement of this period, with hundreds of these aircraft still operating as of 2013. In addition to this biplane and its modifications, a small series of gliders A-9 and A-10 were created and built in the pilot production in Novosibirsk. In 1952, the Bureau was relocated to Kyiv, a city with a rich aviation history and an aircraft-manufacturing infrastructure restored after the destruction caused by World War II. First serial aircraft and expansion The 1957 introduction of the An-10/An-12 family of mid-range turboprop aeroplanes began the successful production of thousands of these aircraft. Their use for both heavy combat and civilian purposes around the globe continues to the present; the An-10/An-12 were used most notably in the Vietnam War, the Soviet–Afghan War and the Chernobyl disaster relief megaoperation. In 1959, the bureau began construction of the separate Flight Testing and Improvement Base in suburban Hostomel (now the Antonov Airport). In 1965, the Antonov An-22 heavy military transport entered serial production to supplement the An-12 in major military and humanitarian airlifts by the Soviet Union. The model became the first