Prototype 2015 of Chinese J-20  Mighty Dragon5th Generation Stealth Fighter Makes Maiden Flight. The prototype 2015 has been has been optimized like USAF F-22 Raptor stealth fighter jet to reduce the frontal Radar cross section (RCS) of aircraft. The J-20 employs twin all-moving tailfins and ventral stabilizing fins and its forward fuselage section to achieve low RCS.