The F-35 is said to be more than 1,200 NM (2,220 KM) by the manufacturer (I don't know if it used an external fuel tank. I guess so)
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KF-21 is said to be 1,550 nm / 2,900 km. However, I know that this is a ferry Range. Calculating internal and external fuels, it seems to come out at the level...