Computer animation of the Hyper-X aircraft, the first jet aircraft designed to fly at more than 5 times the speed of sound, (Mach 5), before launch. The aerodynamic pressures exerted on the Hyper-X and the air around it in flight are color-coded from red, (high pressure), trhough dark blue, (low pressure). Around the aircraft is a high-pressure shock wave. The unpiloted Hyper-X burns hydrogen fuel to fly at hypersonic speeds of up to Mach 10. The Hyper-X uses oxygen from the atmosphere for combustion, rather than having its own supply like a rocket. This increases its payload and range. Live testing began in 2001; today the project remains in limbo.