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The Tigershark has its basic origins in the 50's. Its first N-156 prototype, the predecessor of the F-5 was flown in 1959. the F-20 was developed from the basic F-5 design in the 80;s but retained a lot of the original aircrafts design concepts.
Every fighter jet traces its development from some earlier fighter jet. Sure, F-20 has its roots in F-5, but it is leaps and bounds above F-5. In terms of design, F-20 has relaxed stability design, first introduced with F-16 in the late 70s. In terms of avionics, F-20 has APG-67, glass cockpit, fly by wire, none of which F-5E has. In terms of weapons, F-20 has AIM-7, again something F-5E does not have. F-20 is not even considered an F-5 variant, despite initially designated F-5G. Likewise, JF-17 has its roots in the MiG-21, but by the time JF-17 went into serial production in 2007, it was different from MiG-21 in every nut and bolt. F/A-18E traces its development to YF-17 of the early 1970s, but is considerably more advanced from airframe design to avionics to weapons.