MOJAVE - Nearly four years after British mogul Sir Richard Branson announced he intended to fly paying passengers into space, the first step in a new era of commercial space travel was unveiled Monday at the Mojave Air and Space Port. WhiteKnightTwo, the prototype mothership for Virgin Galactic commercial passenger spaceline, was revealed before international media, aerospace enthusiasts and assorted dignitaries. "This is quite something, isn't it?" Branson, the Virgin Group founder, asked those gathered, calling WhiteKnightTwo "one of the most beautiful and extraordinary aviation vehicles ever developed." Designed and built by Scaled Composites, the Mojave firm founded by aviation...