4401 was delivered in August 1966 and was in the service in Czechoslovak Air Force during years 1966-1990. Mig-21 was a backbone fighter of Czechoslovak Air Force till 1990.
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The Mikoyan-Gurevich MiG-21 (NATO reporting name "Fishbed") is a supersonic jet fighter aircraft, designed by the Mikoyan-Gurevich Design Bureau in the Soviet Union. It was popularly nicknamed "balalaika", from the aircraft's planform-view resemblance to the Russian stringed musical instrument. Early versions are considered second-generation jet fighters, while later versions are considered to be third-generation jet fighters. Some 50 countries over four continents have flown the MiG-21, and it still serves many nations a half-century after its maiden flight. The fighter made aviation records. At least by name, it is the most-produced supersonic jet aircraft in aviation history and the most-produced combat aircraft since the Korean War, and it had the longest production run of a combat aircraft (1959 to 1985 over all variants).
Links: en.wikipedia.org, www.airwar.ru, russianplanes.net