The Fireflash is a nuclear powered hypersonic airliner.
It has six atomic motors that enable it to stay in the air for a maximum of six months; however, their radiation shielding must be maintained frequently, or the passengers will only be able to spend a maximum of three hours in the aircraft before succumbing to radiation sickness.
A novel feature is that the flight deck is built into the tail fin. Like the real-world Airbus A380 she has two decks, but also features luxury facilities such as a cocktail lounge housed within glazed sections of the wings' leading edges.
On one occassion, Fireflash was forced to land while supported by Elevator cars transported to the landing site by Thunderbird 2, due to the presence of a bomb planted in it's undercarriage by The Hood.