The SR-71 does not run on standard military JP-8 aviation fuel because it could vaporize of spontaneously ignite at the high altitudes and speed the SR-71 could fly at. A special aviation fuel, JP-7 was developed exclusively for the SR-71.<ref>https://boltflight.com/why-the-sr-71-blackbird-needed-a-custom-fuel-to-conquer-the-skies/</ref>