F-2A/B(FS-X)
Japanese F-16 derivative produced by Mitsubishi Heavy Industries, with cooperation from Lockheed Martin. It is larger and utilizes mainly Japanese avionics.
Взято из википедии.
Как видим взял за основу всётаки был Ф-16, а не сделан с нуля..
http://en.wikipedia.org/wiki/F-16_Fighting_Falcon
Work started in 1980s under the FS-X program, and began in earnest with a memorandum of understanding between Japan and the United States. It would lead to a new fighter based on the General Dynamics (post '93, Lockheed Martin) F-16 Fighting Falcon, and in particular the F-16 Agile Falcon proposal.
http://en.wikipedia.org/wiki/Mitsubishi_F-2