The KF-21 Boramae, the nation's first domestically developed fighter jet, made history with a successful maiden flight, Tuesday, making Korea the world's eighth country to develop an advanced supersonic warplane. According to the Defense Acquisition Program Administration (DAPA), the KF-21, the 4.5-generation fighter produced by Korea Aerospace Industries (KAI), took off at the third Flying Training Wing of the Air Force in Sacheon, South Gyeongsang Province, and flew around the area for more than 30 minutes.