During June 2007, South Korea and Turkey successfully negotiated a KRW₩500,000,000,000 (approximately US$540,000,000) contract for 40 (+15) KT-1s; this exchange involved the modular armor technology of the K2 Black Panther main battle tank (MBT), which Turkey hopes to use upon its own future indigenous Atlay MBT. The last of these aircraft, which were designated "KT-1T" and jointly manufactured by the two nations, was delivered during late 2012. During April 2015, it was announced that Turkey would procure a further 15 KT-1Ts as a stop-gap measure until development of its indigenous TAI Hürkuş trainer aircraft could be completed.