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SR-91 Aurora Spy Plane: Mach 5 Fact or Fiction?

SR-91 Aurora
SR-91 Aurora, artist rendition. Image Credit: Creative Commons.

Within my very first published article for 1945, a primer on the SR-71 Blackbird, I made a brief mention of the mysterious SR-91 Aurora spy plane as a possible successor to the Blackbird.  Hypothetically, the Aurora could reach Mach 5+, making it indeed the fastest manned aircraft ever to fly.

SR-91 Aurora

SR-91 Aurora, artist rendition. Image Credit: Creative Commons.

However, it is a matter of speculation as whether or not the Aurora has ever even actually existed (the plane, that is; the American city of Aurora, Colorado certain does exist, and I imagine it’s upstanding and hard-working residents would not particularly care to be rendered “unpersons” a la George Orwell’s 1984).

To make matters a tad bit more confusing to the casual researcher, there is an airplane with the Aurora moniker whose existence is a known commodity, that being the Lockheed CP-140 Aurora, a maritime patrol craft used by the Canadian Forces for activities such as antisubmarine warfare (ASW), but definitely not the science fiction-worthy capabilities of the (most likely apocryphal) spy plane.

SR-91 – A Real Life “X-File?”

The rumor intelligence (RUMINT) about the SR-91 Aurora kicked off in March 1990, when Aviation Week and Space Technology first broke the news that the term “Aurora” was inadvertently released in the 1985 US budget as an allocation of $455 Million for “black aircraft production” (as opposed to R&D) in FY 1987.

The initial rumors quickly gained more ground (or more altitude, if you prefer) after observers in Nevada claimed to have seen and heard a distinctive aircraft flying over the Mojave Desert at high altitude and speed, usually in the early morning; these eyewitnesses described the contrail as “doughnuts on a rope” and claimed the engine note at take-off “sounds like the sky ripping.”

Furthermore, alleged sightings of the Aurora soon made their way “across the pond” to Britain, beginning in late August 1989 with Chris Gibson, a 12-year veteran of the Royal Observer Corps and an expert on aircraft recognition; Mr. Gibson saw a triangular plane—unlike anything he had ever seen—flanked by two US fighters being refueled in flight by a tanker while he was working on the Galveston Key oil rig in 1989.

“There was no precedent for this,” he said. “I kind of sussed out that it was something I shouldn’t have seen.”  In the spirit of the “special relationship” between the UK and the US, Her Majesty’s Government officially downplayed the stories such as Mr. Gibson’s, but there is evidence that behind the scenes, the UK Ministry of Defence (MoD) took the rumors much more seriously.  Fast-forwarding to May 2006, the MoD published a report referring to U.S. Air Force priority plans to produce a supersonic vehicle that could reach speeds of Mach 4 to 6, which in turn fueled speculation that may have been another reference to the SR-91.

SR-91: Playing Out the String

So then, assuming for argument’s sake that the Aurora actually does exist—or at least did at one time—why do we know so little about it, i.e. how is it that the U.S. Government is able to keep a much tighter lid on it than was the case with the original Stealth fighter and bomber, the F-117 Nighthawk and B-2 Spirit respectively?

Part of the possible explanation comes from my 1945 colleague Peter Suciu, who notes that “if the Aurora project ever existed, it was likely canceled due to the shift from spy planes to unmanned aerial vehicles (UAVs) and reconnaissance satellites, which can do the same job but with risk to a human operator.”  Moreover, Aurora would fall under as a Special Access Program (SAP), i.e. a “black program” that isn’t generally for public knowledge, and with severe penalties for anybody who would dare to compromise such sensitive information.

SR-91 Aurora

SR-91 Aurora. Image Credit: Artist Rendering.

SR-91 Aurora

SR-91 Aurora. Image Credit: Creative Commons.


SR-91 Aurora. Image is an Artist Rendering. Image Credit: Creative Commons.

In the meantime, all we can do is continue to speculate, and, in the spirit of The X Files, channel FBI Special Agent Fox Mulder (David Duchovny) and declare, “The truth is out there, Scully.”

BONUS: SR-71 Photo Essay


SR-71. Image: Creative Commons.


SR-71 Spy Plane.


Image Credit: Creative Commons.

North Korea SR-71

Image: Creative Commons.

SR-71 and F-16

SR-71 and F-16. Image: Creative Commons.

SR-71 Engine from Pratt & Whitney J58

SR-71 Engine from Pratt & Whitney J58

Christian D. Orr is a former Air Force officer, Federal law enforcement officer, and private military contractor (with assignments worked in Iraq, the United Arab Emirates, Kosovo, Japan, Germany, and the Pentagon).  He has also been published in The Daily Torch and The Journal of Intelligence and Cyber Security.

Written By

Christian D. Orr is a former Air Force officer, Federal law enforcement officer, and private military contractor (with assignments worked in Iraq, the United Arab Emirates, Kosovo, Japan, Germany, and the Pentagon).



  1. warren trout

    May 18, 2022 at 3:53 pm

    How would you see it inflight refueling? Have you EVER seen an aircraft inflight refueling? NO, because it’s too high to see. And what would the supposed aircraft need fighter escort for?

    Beware of so called British Intelligence. Same people who brought us the Russian/Trump collusion that was totally made up propanda.

    • Mr. Mitzelpix

      May 20, 2022 at 7:49 pm

      How would they see it? seriously? I think four planes in unusually close quarters but at some altitude would stand out, with tankers being enormous with a distinctive silhouette. If you can see an airliner at 4 or 5 miles up, why not planes where one is oversized and the other an odd shape, both very dark. And finally, maybe he grabbed some binoculars to see more detail. people do things like that.

    • Doug Dillon

      June 2, 2022 at 7:06 pm

      Seen a rendering of it in the Chaplains office on Chanute AFB in the 1980’s

  2. Jeff

    May 19, 2022 at 1:28 am

    Mach 5. Problems
    1. Heat 2. Heat 3. Heat

  3. James Blanton

    May 19, 2022 at 9:03 am

    The economics of this aircraft are unreal to the expensive side. A fractional orbit reconnaissance mission with a rocket is much more suitable cost wise and certainly “uncatchable”.

    Money spent on things like the Hubble would have been better spent with two Hubbles in orbit, on opposite sides of the Earth, and with optics designed for terrestrial viewing. But whatever..

  4. Mark Ingraham

    May 24, 2022 at 6:06 am

    You used the fighters anthology aurora.

    In reality the aurora was malfunctioning terrier missiles. When the fuel is burned too fast these missiles reach mach five and produce the characteristic donut exhaust. However nobody wants to admit that malfunctioning missiles were the reason for aurora sightings.

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