question: KAI KF-X was the model that followed which South Korean supersonic trainers and combat aircraft?
answer: KAI T-50 Golden Eagle
context: Title: KAI KF-X
  Passage: The Korea Aerospace Industries KF-X/Indonesian Aerospace IF-X is a South Korean and Indonesian program to develop an advanced multirole fighter for the Republic of Korea Air Force (ROKAF) and Indonesian Air Force (TNI-AU), spearheaded by South Korea with Indonesia as the primary partner.  It is South Korea's second fighter development program following the FA-50.
  Title: Diverterless supersonic inlet
  Passage: A diverterless supersonic inlet (DSI) is a type of jet engine air intake used by some modern combat aircraft to control air flow into their engines.  It consists of a "bump" and a forward-swept inlet cowl, which work together to divert boundary layer airflow away from the aircraft's engine.  This eliminates the need for a splitter plate, while compressing the air to slow it down from supersonic to subsonic speeds.  The DSI can be used to replace conventional methods of controlling supersonic and boundary-layer airflow.
  Title: Kuznetsov NK-32
  Passage: The Kuznetsov NK-32 is an afterburning 3-spool low bypass turbofan jet engine which powers the Tupolev Tu-160 supersonic bomber, and was fitted to the later model Tupolev Tu-144LL supersonic transport.  It is the largest and most powerful engine ever fitted on a combat aircraft.  It produces 245 kN of thrust in maximum afterburner.
  Title: KAI T-50 Golden Eagle
  Passage: The KAI T-50 Golden Eagle (골든이글) is a family of South Korean supersonic advanced trainers and light combat aircraft, developed by Korea Aerospace Industries (KAI) with Lockheed Martin.  The T-50 is South Korea's first indigenous supersonic aircraft and one of the world's few supersonic trainers.  Development began in the late 1990s, and its maiden flight occurred in 2002.  The aircraft entered active service with the Republic of Korea Air Force (ROKAF) in 2005.
  Title: Curtiss-Wright AT-9
  Passage: The Curtiss-Wright AT-9 Jeep was a twin-engined advanced trainer aircraft used by the United States during World War II to bridge the gap between single-engined trainers and twin-engined combat aircraft.  The AT-9 had a low-wing cantilever monoplane configuration, retractable landing gear and was powered by two Lycoming R-680-9 radial engines.
citations: KAI T-50 Golden Eagle KAI KF-X