Re: New JF-17/FC-1 Fighter Aircraft thread
Fighter generations can be distinguished by its manufacturing era, capability, comparison to similar aircraft, etc.
From a capabilities point of view, 3rd generation aircraft had specific roles and weak multi-role capability. i.e. Fighter, fighter-bomber, fighter-attacker, interceptor, etc. They rarely got upgraded to true multi-role capability prior to retirement.
4th generation fighters started off as single-role aircraft, but evolved toward multi-role capability. For example, MiG-29, Su-27, F-16, etc.
Later, when 4th generation fighters rolled off the assembly line with multi-role capability "pre-installed" and better electronic systems, some called them 4.5 gen. But essentially they're still just upgraded 4th gen aircraft, with slightly improved airframe and engines.
5th generation fighter aircraft is "stealth" or "stealthy".
So where does JF-17/FC-1 fit in this? I'd say somewhere in 4th to 4.5 gen category. The first and most important reason is because the airframe and power plant are 4th generation class. You can always upgrade weapons and electronics, but if the aircraft was built with 3rd generation airframe, you can't upgrade without building a new aircraft.
In comparison, the JL-9/FTC-2000 was built with modified 3rd generation airframe and power plant. If this aircraft was installed with modern radar and weapons, or even an engine upgrade, it might possibly qualify as 3.5 gen but not 4th gen.