CRITICS ARGUE that there was never enough money hidden in intelligence and military budgets to fund a small fleet of spaceplanes and carrier aircraft. However, those who worked on [Blackstar's] development at several contractor sites say they charged time-and-materials costs to a number of well-funded programs. Lockheed was the lead contractor for Blackstar orbiters being fabricated at McDonnell Douglas in the early 1990s, and workers there typically logged their time against a specific Lockheed charge number associated with that project. But their time might also have been charged to the National Aero-Space Plane (NASP) and the Navy's A-12 fighter accounts, they say. Both multibillion-dollar programs were canceled with little but technology development gains to show for massive expenditures.
The whole article is an interesting read for those of you with an interest in "black" programs.