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Not that i can think off but all these trainers where designed in the 70s or 80s and Delta wing seems to have caught on more so in this century than the last. You have more delta winged models coming out in the world now with the EF,Rafael, J-10, j-20, Tejas etc., Also i guess it would be cheaper and unnecessary to have an complex airfoil like an Delta wing on a trainer.BTW, is there an air force that uses a delta winged jet trainer?