A video of last week’s successful X-51 scramjet test flight: The X-51A soars to new heights – Boeing

Update: More about the flight from Michael Belfiore : X-51A Screams to Hypersonic Success: A nine-year development effort has finally paid off to create air-breathing planes that can hit Mach 5 and above. PM gets an update from program officials about what this means to the future of flight – Popular Mechanics – May.9.13.