The KAI KF-21 Boramae (Korean: KF-21 보라매, romanized: KF-21 Hunting Hawk; formerly KF-X; commonly KF-21) is a South Korean twin-engine fighter aircraft. The initial goal of the program was developing an indigenous multirole fighter for the Republic of Korea Air Force (ROKAF). The airframe of the Blocks I and II adopts semi-stealth technology with partially embedded external weapons, with full stealth—including internal bays—and MUM-T (Manned-Unmanned Teaming) capabilities planned for the Block III or KF-21EX variant. The KF-21 is South Korea's second domestic fighter jet development program, following the FA-50 series.
The Block I program is led by the South Korean government, which holds 60% of the shares. An additional 20% is held by the manufacturer Korea Aerospace Industries (KAI), with Indonesia holding the final 20% stake. Later, in August 2024, Indonesia's stake was reduced to 7.5% due to Indonesian government request. The Block II program, which focuses primarily on the serial integration of air-to-ground and air-to-ship armaments, will be executed solely by South Korea through early 2027. The Block III, or KF-21EX, program will be carried out with newly formed international partners.
