[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.

[gov_bean_ counter]

So has NASA honestly determined why the program suffered so many overruns and delays and take steps to fix it?

No, because all too often the finger points to contractors and subs who received contracts due to a Small and/or Disadvantaged Business designation. Too PC to touch.