[Crusader21stCentury]

You may want to take a look at this link.

SPACE.COM VENTURESTAR

[Brett66]

Yep, the program didn't go as planned, not by a long shot. So has NASA honestly determined why the program suffered so many overruns and delays and take steps to fix it? I don't think they have, so any attempt to build a next generation shuttle/spaceplane stands a good chance of suffering the same fate.