The Su-30, designated Flanker-C by NATO, is today the most widely used fighter of the Flanker family. This all-weather fighter is a variant of the Su-27UB and entered service in 1996. The Su-30MK and Su-30MKI versions were the most commercially successful versions of the Flanker-C, the Su-30 being responsible for introducing the use of a data link into Russian aircraft. All Su-30s are manufactured at the KnAAPO plant, except for the Su-30MK and Su-30MKI Flanker-H, which are manufactured at the Irkutsk plant. , which is considered the most advanced of the Sukhoi fighter plants [1. The Su-30 also became the first aircraft to use a data transmission system.