The Lynx, like the EADS announced space plane, will take off like a conventional aircraft and then once it has reached a certain altitude will fire rockets to boost it up to sub orbital height.
Richard Branson's Virgin Galactic plane uses a different method and will be carried on the back of a larger plane to get it up to altitude.
This is also the method of choice for the mysterious reputed US Government Blackstar space plane.
The XB-70 Plenty of room on top.
Many wondered why the SR 71 Blackbird was retired in 1990 and theorists think that the US had a super-secret replacement pulling together a launch plane based on the notorious XB70 Valkyrie bomber and the NASA Dyno-soar orbiter.
The first rocket plane was the German Messerschmitt interceptor although there was a proposal to produce a manned version of the A4 (essentially a V2 rocket with a cockpit) which was never realised. Probably just as well!
Proposed German A4 rocket plane
Agent Triple P can't help thinking that these space planes are to space flight what those waterline reef observatory boats are to submarines, i.e. not the real thing. If you really want to get into space then you have to pay the Russians £25,000,000 to take you up in a proper rocket.