Fireflash is a commercial passenger jet designed 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, ram jets capable of Mach 5, room for at least 16 passengers, self-propelled escape pod and a large cargo bay behind the cabin.

These aircraft have a very long range, making them ideal for ultra long haul routes out of London. Flying to destinations such as Rio de Janiero and Sydney.

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