How many thunderbirds were there?

Answer 1

Thunderbird 1 - Hypersonic Variable-sweep wing rocket plane used for fast response, rescue zone reconnaissance, and as a mobile control base.

Thunderbird 2 - Heavy supersonic VTOL carrier lifting body aircraft used for the transport of major rescue equipment and vehicles, including Thunderbird 4.

Thunderbird 3 - Reusable, vertically launched SSTO (Single Stage To Orbit) spaceship used for space rescue and maintenance of Thunderbird 5.

Thunderbird 4 - Small utility submersible for underwater rescue.

Thunderbird 5 - Earth-orbiting space station which monitors all broadcasts around the globe for calls for help and also manages communications within International Rescue.

Thunderbird 6 - a 1930s Tiger Moth biplane used once when the usual vehicles proved too heavy for the job, and only appeared in the movie of the same name. The title "Thunderbird 6" is mostly honorary.