One of the first export customers for the KT-1 was Indonesia. During early 2001, Indonesia exchanged 8 CASA/IPTN CN-235 transport aircraft for 12 KT-1 trainers. On 25 April 2003, the first KT-1 was delivered to Indonesia, a move which represented the first Korean aircraft export; commenting at the time, KAI stated that it was presently in negotiations for a 13-trainer follow-on order. During early 2011, reported emerged that Indonesia was interested in further acquisitions, but South Korean officials denied that any further barter deals had been agreed. During November 2018, three additional KT-1B aircraft were ordered for the Indonesian Air Force (IAF).