The Royal Thai Air Force (RTAF) announced on 4 April that it had commissioned the first batch T-50TH lead-in fighter trainers.

The T-50TH supersonic advanced trainers of 401st Squadron was inducted into the RTAF, at its Wing 4 Base Takhli, Nakhon Sawan, during the commissioning ceremony. The four aircraft were inducted on 4 April at an airbase in Nakhon Sawan, in a commissioning ceremony presided over by RTAF Commander Air Chief Marshal Johm Rungswang.

The first two of Korea Aerospace Industries (KAI) T-50TH Golden Eagle Lead-In Fighter Trainers (LIFT) serial 40101 and 40102, 401st Squadron will arrive at Wing 4 RTAF Base Takhli, Nakhon Sawan, Thailand on 25 January 2018.

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The T-50TH developed to train and prepare pilots for the F-16 and JAS-39, replacing trainers such as L-39s in service with the RTAF. The T-50TH lead-in fighter trainers developed by Korea Aerospace Industries (KAI) with Lockheed Martin.

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Korea Aerospace Industrie has delivered 4 of a total of 12 T-50TH aircraft. Thailand is currently signed up for 12 T-50TH aircraft across two batches of four and eight respectively.