KFX/IFX jet fighter to be build by Indonesia and South Korea - UPI.com That's interesting. This I think will be the first Asian 4.5 gen fighter, developed to rival the likes of Eurofighter and Rafale. It will be designated the F-33 when production begins. South Korea has the technology and experience with operating and maintaining Western fighter aircraft, while Indonesia is contributing 20 % of the cost and 30 Engineers. SK is also looking for collaoration with several Western defense firms.