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いや、i3は普通に第六世代として海外でも認識されてるぞ？

A sixth-generation jet fighter is a conceptualized class of fighter aircraft design more advanced than the fifth-generation jet fighters
that are currently in development. Several countries have announced the development of a sixth-generation aircraft program,
including the United States, China, United Kingdom, Russia, Japan, Germany, and France.
In 2010, the Japanese Ministry of Defence exposed the concept of sixth-generation national product jet fighter.[9]
This would be based on the 3I concepts of an aircraft that was Informed, Intelligent and Instantaneous.[10]
On March 22, 2016, Japan conducted the first flight of the Mitsubishi X-2 Shinshin testbed aircraft for this project.
https://en.wikipedia.org/wiki/Sixth-generation_jet_fighter


The above technologies check off many characteristics of conceptual sixth-generation fighter jets—(though optional-manning
and drone-control have yet to be mentioned),
https://nationalinterest.org/blog/buzz/put-f-22-and-f-35-museum-japans-6th-generation-fighter-will-be-epic-62942