Fireflash is a commercial passenger jet created by Brains and developed for the Air Terrainean corporation, as seen in the Thunderbirds Are Go! series. It features a cruise height of 75,000 feet, supersonic boost speed of Mach 5, room for at least 16 passengers, self-propelled escape pod, and can travel from London to Australia within a few short hours.

Recently the aircraft was fitted with a new hypersonic engine, which made it an ideal target for The Hood.