Antonov State Company , formerly the Antonov Aeronautical Scientific-Technical Complex (Antonov ASTC) , and earlier the Antonov Design Bureau, 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 planes are currently operating in the former Soviet Union and in developing countries.