This is some info from sites about the X-43A that I found. To show your appreciaton for my work please get me one for Christmass.
Flight of the X-43 vehicles will be the culmination of over 20 years of scramjet (supersonic combustible ramjet) research and the first time a non-rocket engine has powered vehicles at hypersonic speeds.
Built by Micro Craft, Inc., Tullahoma, TN, for NASA's Hyper-X program, the 12-foot-long, unpiloted X-43 vehicles will significantly expand the boundaries of air-breathing aircraft.
Yahoo gave me these other sites: