WhiteKnightTwo going to fly in July

So its not SpaceShipTwo, but its still pretty sweet. Virgin Galatic's/Richard Branson's/Burt Rutan's/Scaled Composites's/Northrop Grumman's newsest and most badass payload carrier(read: spaceship and anything else someone would pay them to carry) should fly in July. It will also have passenger capability, so you can watch you more adventurous significant other blast off into the great black yonder.

According to the press release: "WhiteKnightTwo is the world's most advanced payload carrier. It has the best fuel efficiency of any aircraft ever built in history. It is the world's first 100% carbon composite aircraft."

That middle sentance is the one I find most interesting...