The deployment of the Su-27 Flanker and MiG-29 Fulcrum in the mid-1980s leveled the playing field. Designed as a high performance fighter with a fly-by-wire control system, and the ability to carry up to 10 AAMs, the highly maneuverable Su-27 is one of the most imposing fighters ever built. The first 'Flanker-A' prototypes flew on May 20, 1977 and entered service as the 'Flanker-B' in 1984. The development of the Su-27 fighter plane was completed in the early 1980s, and the plane subsequently set more than 40 world records of altitude and take-off-speed. It was the forerunner of an entire family of planes, including the Su-27UB training plane, the Su-33 ship-based fighter, the Su-37 multi-mission plane and the Su-32FN two-seat specialised plane. The Su-27UB is a two seat training version of Su-27, which first flew in March 1985.