 The wing blends into the fuselage at the leading edge extensions and is essentially a cross between a swept wing and a cropped delta (the delta wing with tips cropped for missile rails or ECM pods).The fighter is also an example of a tailed delta wing configuration, retaining conventional horizontal tailplanes.The Su-27 had the Soviet Union's first operational fly-by-wire control system, based on the Sukhoi OKB's experience with the T-4 bomber project.