South Korea Receives First KF-21 Fighter Jet – A New Era for Korean Air Power Begins

Military Sentinel, Seoul – The Republic of Korea Air Force (ROKAF) has taken delivery of its first production KF-21 fighter jet, transitioning Seoul’s flagship indigenous combat aircraft program from developmental flight testing into operational service.

The aircraft departed Korea Aerospace Industries’ (KAI) production facility in Sacheon and arrived at a ROKAF base in Yecheon, escorted by a formation comprising an FA-50 light combat aircraft, a TA-50 lead-in trainer, and a T-50 Golden Eagle supersonic jet. The handover marks an essential milestone for the domestic program, coming four years and two months after the initial prototype completed its maiden flight in July 2022.

Formal Shift to Operational Service

The handover officially shifts custody of the airframe from state procurement managers and industry test teams to operational squadron personnel.

“Overcoming numerous trials and hardships, the KF-21 was handed over to the Air Force today and commenced flight operations,” said Gen. Son Sug-rag, Chief of Staff of the Republic of Korea Air Force, in a joint announcement with the Defense Acquisition Program Administration (DAPA). “Up until yesterday was the time for the Boramae project’s policymakers and developers. From today onward, it is the Air Force’s time.”

To support operations, ROKAF reactivated its 156th Fighter Squadron earlier this year. The unit had remained dormant for roughly 14 years following the retirement of its legacy McDonnell Douglas F-4E Phantom II aircraft.

Program Milestones and Production Schedule

Originally conceived in 2001 by then-President Kim Dae-jung to replace aging fleets of Northrop F-5E/F Tiger IIs and F-4 Phantoms, the program formally launched development in late 2015 alongside partner nation Indonesia. Full-rate series assembly commenced in mid-2024 after rigorous aerodynamic evaluations.

• May 2026: Formal completion of combat compatibility certification.

• June 2026: Systems development phase finalized; 156th Fighter Squadron reactivated.

• Block 1 Delivery Target (by 2028): 40 airframes optimized for air-to-air engagements.

• Block 2 Delivery Target (by 2032): 80 additional units integrated with standoff precision-guided air-to-ground ordnance.

• Long-Term Inventory Goal: Over 120 aircraft fielded by the mid-2030s.

The baseline KF-21 Block 1 features an active electronically scanned array (AESA) radar, an infrared search and track (IRST) sensor, and semi-conformal fuselage weapon wells carrying Meteor beyond-visual-range air-to-air missiles.

Strategic and Industrial Implications

The entry of the KF-21 into ROKAF inventory solidifies South Korea’s position among a small group of nations capable of indigenously manufacturing advanced supersonic combat jets. Operationally, the platform establishes a high-low operational mix alongside the country’s conventional fleet of fifth-generation Lockheed Martin F-35A Lightning II stealth fighters and upgraded Boeing F-15K Slam Eagles.

Beyond domestic defense readiness against northern regional threats, the airframe is positioned as an export competitor in the global 4.5-generation market, offering modern avionics and reduced radar cross-section characteristics at competitive operating costs. Follow-on funding outlined in upcoming defense allocations is slated to sustain current Block 1 assembly lines while maturing Block 2 multirole sensor integration and future internal weapons bay upgrades.