X-24C
NHFRF
Aurora?
Hmm…
The following is based on the most logical hypothesis.
I don't buy the AURORA as an hypersonic-related project identifier. AURAOA was likely an acronym which I discussed in an earlier post. I suggested AU = Advanced Unmanned, and R O R A as a mix of Reconnaissance, Observation, Research, Remotely Operated, Aircraft or anythong along these lines. Suggestions welcome as I have no real clue. If this hypothesis proves right, then nobody lied at the time. There was no such thing as a manned hypersonic something called the Aurora…
However the timeline you mentionned could be improved by a new one below, whose key points matches Francillon's book contents, uncommon sonic booms and USGS sensor captures, as everything else in the idusty could be justified by a very practical cover story: NASP.
So, to make a long timeline short, here is what I came up with, in a nutshell:
White X24C
--> White NHFRF
--> Black NHFRF (1980/1982)
--> Black manned prototype platform flown tested in around 1986
--> Black operational M=5/6 SR-71 replacement (ASTRA ?) with an IOC around 1988 (SR71 retirement)
--> Technical problems (as always) in around 1993 requiring a majore fix but notsufficient (?) leading to one or more bird loss due to technical issues (i.e. Boscombe Dawn incident, 1994) which might have been caused by PIO (Pilot Induced Oscillations).
--> Black hypersonic fleet grounded. This or these incident(s) might have grounded these new birds for awhile leading to the
--> reactivation of SR-71 up until their definitive retiement sometime around 1997-1998
--> Then I lost track of all hypothethical story.
--> 2003 The Falcon project served the same purpose as NASP in my opinion: a cover story to to mature the new generation of hypersonic projects oe of which could have recently epitomized as an SR-72 (but I'm not sure).
Back to the basics, the timelien I refer to is "old" hypersonics stuff. In 1988, a ittle known hypersonic conference was organized at Nasa Dryden in which the GHP Generic Hypersonics Program was kicked-off. GHP was some sort of a theoretical effort to mature new hypersonic designs across the entire hypersonic spectrum. It was my opinion at the time that you just don't get yourself into any such far-reaching initiative of you don't already have a sound idea and/or concrete results that something is working that you must improve.
This was so long ago. And technology can be forgotten when rookies retire.
A.