The Sukhoi Su-27 Flanker is a twin-engine multirole fighter (S version) / pure fighter-interceptor aircraft (P version). First prototype of T10-1 (Sukhoi internal designation) flew in May 1977. The production Su-27S "Flanker-B" began to enter Soviet AF service in 1985, while the twin-seater Su-27UB ("Flanker-C") appeared only in 1987.
