This article is about a fictional aircraft. For the real aircraft of this designation, see Mikoyan MiG-31

The Mikoyan MiG-31 (fictional NATO reporting name Firefox) is a fictional aircraft in the novels Firefox (and the subsequent movie) and Firefox Down , both written by Craig Thomas.

The MiG-31 is an interceptor capable of stealth and hypersonic flight. It allows the pilot to control weapons and other flight systems via thought, with the caveat that the system only understands thoughts in the Russian language, leading to the training mantra for foreign pilots: "Think in Russian!" Before it could be deployed into active service for the Soviet Air Force, it was stolen by Mitchell Gant operating on behalf of the Western intelligence community.