Firefox

Firefox is both the title of the film and the code name for the jet fighter stolen by Mitchell Gant (Clint Eastwood, who also directed) from the Soviet government during the Cold War. The film was released in 1982. The story isn't as concerned with the actual theft of the plane, inasmuch as Gant's attempt to infiltrate the Soviet Union and the airbase where the plane is being developed.

MiG 31 "Firefox"
A entirely fictional jet fighter developed by the Soviet government that is described by intelligence officers and military experts as the most sophisticated plane ever designed. The pilot would utilize a thought-commanded weapons system, giving them a several-second advantage in reaction time during combat.