At least we think so.
The three F-35 "variants" share very few design elements outside of their cockpits. Lt. Gen. Christopher Bogdan, then the head of the F-35 program office, in 2016 told a seminar audience that the F-35 models are only 20- to 25-percent common.
Lockheed Martin in mid-February 2019 offered to sell India a new fighter the company calls the "F-21."
(This first appeared several months ago.)
Only it doesn't look like a new fighter at all. The F-21 looks...
Read this story at The National Interest