I spoke to a high-level Pentagon source who is intimately familiar with all past and current U.S. hypersonic programs. He said the AURORA line item in
the 1986 budget was not an aircraft program at all, but merely a funding line for facilities to support development of the B-2 Advanced Technology
Bomber.
He also said there was no hypersonic SR-71 replacement. The "Aurora" rumors of the late 1980s and early 1990s were apparently the result of
creative guesswork and wishful thinking.
Two programs to watch now are Blackswift and X-51. While Blackswift offers a sexier platform (i.e. a global flyer), it has a long way to go,
technologically, toward achieving any sort of practical operational system. The X-51 Scramjet Engine Demonstrator/WaveRider project offers more in the
short term. Technology from X-51 will eventually have applications for air-breathing access to space, but more readily provides a system that could
easily be adapted to hypersonic weapons.




