What was the type of plane in the movie Firefox?
The supersonic fighter in the Clint Eastwood movie, "Firefox",
was fantasy. It was supposed to be a new Russian super-sonic
fighter that could fly faster than any jet of that time. The movie
was pure fiction and not based on any actual events.
The aircraft is called a MiG-31 - it was a speculative design
based on available knowledge of stealth aircraft design.