Last week, NASA Administrator Jared Isaacman cryptically teased plans for a new high- and fast-flying X-plane with a silhouette of an aircraft that immediately drew comparisons to the famed SR-71 Blackbird as a backdrop. In our report, we looked at what it could mean, including the possibility of reviving the SR-71, or at least using it to inform or even cobble together a new airframe. Now it turns out that an SR-71 that had been on display at NASA’s Armstrong Flight Research Center for years is suspiciously missing.

Steve Trimble, Aviation Week‘s defense editor and friend of TWZ, was first to report the disappearance of the former NASA SR-71, also known by the tail number 844, at Armstrong. That facility is collocated with Edwards Air Force Base in California. Trimble’s piece says that satellite imagery shows the jet has not been seen since at least May 17. The aircraft in question, which originally carried the U.S. Air Force serial number 61-7980, was the last Blackbird produced and the last one to fly, taking to the skies for the final time in 1999.

“The current disposition of the aircraft is unclear, but Aviation Week sources suggest that the aircraft was moved into a hangar earlier this year for an inspection,” according to the story. “The presentation and the disappearance of the display SR-71S with the 844 tail number for NASA raises the possibility of a return-to-flight program after a more than 26-year-long hiatus.”

The presentation mentioned above is the one NASA’s Isaacman gave last week at the annual All-In Summit in Los Angeles, California, during which he shared the SR-71-esque silhouette.

“In the service of the first A [aeronautics] in NASA, we are rebuilding our X-plane fleet. The X-59 is researching quiet supersonic flight, but it’s just the beginning,” he said at that time. “As NASA recommits to flight test and works alongside industry to push the boundaries of airframe and propulsion design, it will not be long before NASA once again is flying as high and as fast as we had in decades past, and then even more.”

Isaacman has made expanding NASA’s X-plane fleets a top priority since taking charge of the agency last year.

“You sure that’s a Blackbird?” the NASA administrator said during a live interview that immediately followed his remarks after the image was brought up, but did not offer any further clarification.

“NASA has a long history of building and flying experimental aircraft that push the boundaries of what is possible,” NASA told TWZ directly when asked for more information. “As Administrator Isaacman has said, we want to see more X-planes flying in the years ahead, developing the technologies that will allow us to fly higher, farther, and faster than we have in decades. We look forward to sharing more as those efforts progress.”

We have reached back out to NASA in light of Aviation Week‘s report.

As we wrote in our initial reporting on Isaacman’s comments:

“As for bringing a Blackbird back into operation for high-speed testing, which is now at the forefront of military aeronautics (and civilian to a lesser degree) after decades of being sidelined, that would be a very challenging operation. The SR-71s are long retired and have been placed in museums and other display areas. While the Pentagon could technically claw some of them back from their ‘on loan’ status, reconstituting even one of them would be a major undertaking as the entire support ecosystem that once sustained them has been gone for decades. Still, having a Mach 3+ capable jet for testing would be a highly relevant tool in a new age of high-speed flight exploration.”

“On the other hand, building a new test aircraft that aims higher and faster than the SR-71, but may be based on its ‘DNA,’ is certainly possible. Such an aircraft could leverage material science, avionics, flight controls, and engines that are seven decades more modern than its progenitor. Technology demonstrators in this class could also already exist in the classified domain. NASA could possibly assume ownership of one after the Pentagon declassifies it, as well.”

“Regardless of how such an exotic aircraft is obtained, one of the biggest differentiating factors could be that a NASA aircraft is piloted by a human onboard, instead of it being a drone, but an uncrewed aircraft is possible too.“

Aviation Week‘s report today notes that tail number 844 would probably be the best available candidate for returning to flight status. In addition to being the last produced and the last to fly, NASA previously upgraded it, including with “an automated digital flight and inlet control system to virtually eliminate the Blackbird’s problem of violent engine unstarts at high speed.” It has also been sitting in a controlled area in the Mojave Desert that is great for preservation.

It is also worth pointing out here that Isaacman is personally aware of the time and resources it takes to reconstitute high-end vintage military aircraft. He founded private ‘red air’ aggressor firm Draken International, making him once the owner of the world’s largest private air force stocked with old jets. His own private collection includes a demilitarized, ex-Ukrainian two-seat MiG-29UB that he flies regularly. He has also been working to restore a former Royal Air Force swing-wing Panavia Tornado F2 interceptor, which would be the most complex private military jet flying, if or when it returned to working condition.

At the same time, the SR-71 is in a completely different category, having been the very definition of a high-demand, low-density asset even at the very peak of its service life with the Air Force. Only 32 of these jets were ever built, and they were notoriously complex and expensive to operate and maintain. The aircraft’s Pratt & Whitney J58 turbojets ran on JP-7 fuel that is no longer in regular production. After 9/11, the possibility was raised of returning a Blackbird to service to support the Global War on Terror, but doing so was projected to cost between $40 and $45 million – and that was just two years after 844’s last flight.

There is also a possibility, in line with Isaacman’s comments last week, that 844 could re-merge in a substantially different, reworked form. There is even the potential it could be retrofitted for uncrewed, or at least pilot-optional, flight. Any such conversion effort would also be a major undertaking, as would sustaining the resulting bespoke jet. As we noted earlier, NASA could also use the SR-71 at Edwards to help inform other future designs.

At the same time, maybe this is all a coincidence and the SR-71 in question is getting some other form of TLC, but its months-long absence is certainly a curious development in light of the current push for new X-planes under Isaacman’s leadership.

Update: 11:00 PM ET –

NASA has now provided TWZ with the following statement in response to our queries for more information about SR-71 tail number 844:

“NASA has a long history of pushing the boundaries of experimental aviation, and we continue to explore opportunities to build on that legacy. As Administrator Isaacman has said, we want to see NASA flying higher, farther, and faster than we have in decades. We recognize the interest in the SR-71 and its remarkable history at NASA but have no additional information to share regarding the aircraft at this time.”

Update: 9/25/2026 ET –

It has come to our attention that NASA Administrator Jared Isaacman made additional comments regarding the SR-71 at the EAA AirVenture airshow in July.

“There was a time that a lot of the technology that you see demonstrated here in the F-22 Raptor, like thrust vectoring controls, fly-by-wire, was pioneered by NASA. This is during the days when we had X-planes that included the SR71 Blackbird,” Isaacman said during a speech at the event. “We’re rebuilding our X-plane uh portfolio. We’re going higher, we’re going faster, until we blur the lines between in and out of the atmosphere, and that’s underway right now.”

“I’d say that NASA intends to field an exciting, inspiring, and technologically useful portfolio of X-planes, and I want us to go higher and faster than we’ve ever gone before,” he added during a subsequent question-and-answer session when asked specifically about any plans for a new crewed hypersonic aircraft or a successor to the SR-71. “We’ll see if we can pull anything off in the next handful of years, but, yeah, that is an area of great interest from a developmental perspective.”

Isaacman’s full speech at EAA AirVenture 2026 and the subsequent question-and-answer session are contained in the video below. The SR-71 comes up at 7:35 and 36:35 in the runtime.

The SR-71 also came up during a separate panel discussion at the AirVenture show, which included Isaacman.

“What aircraft that you haven’t flown would you like to try?” a member of the audience asked.

“SR-71 Blackbird,” Isaacman chimed in first without any hesitation.

The other panelists agreed.

“Do you have the power to bring that back then, Jared? That’s the next question,” the panel’s moderator added.

“That’s classified,” Isaacman responded.

The full panel discussion can be found in the video below. The exchange above starts at 1:00:50 in the runtime.

Contact the author: joe@twz.com

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NASA Administrator Jared Isaacman has left something of a mystery hanging in the air after showing the silhouette of an aircraft that immediately drew comparisons to the famed SR-71 Blackbird during a recent speech. Isaacman pushed back on a direct link to the SR-71, but said his agency is working hard to get “back in the business of flying high and fast again.”

The silhouette, accompanied by the tagline “Rebuilding our X-plane portfolio,” was among the backdrops for Isaacman’s remarks at the annual All-In Summit in Los Angeles, California, last week.

The SR-71’s iconic shape is defined by its long, sword-like profile, pronounced chines, and deeply swept wings, and huge spiked engine nacelles with canted fins on top. Its distinctive geometry is reflected in the silhouette, which shows a broad, highly blended aircraft from an unusual head-on angle.

“In the service of the first A [aeronautics] in NASA, we are rebuilding our X-plane fleet. The X-59 is researching quiet supersonic flight, but it’s just the beginning,” the head of NASA told attendees. “As NASA recommits to flight test and works alongside industry to push the boundaries of airframe and propulsion design, it will not be long before NASA once again is flying as high and as fast as we had in decades past, and then even more.”

Isaacman’s full speech at the All-In Summit, as well as his remarks during a live interview that followed immediately afterward, are contained in the video below. The high-speed aircraft silhouette is first seen at around the 12:40-mark in the runtime, and is then further discussed at around the 28:39-mark.

Chamath Palihapitiya, co-host of the All-In Podcast and one of the hosts of the summit, asked Isaacman directly about the silhouette during the fireside chat after his speech.

“You showed a picture of the [SR-71] Blackbird up there,” Palihapitiya said at one point, before Isaacman interjected.

“You sure that’s a Blackbird?” Isaacman said.

“Well, ok. What was that picture you showed up there?” Palihapitiya asked.

“Like I said, NASA is getting back in the business of flying high and fast again,” Isaacman said in response, and declined to further elaborate.

Whether or not the silhouette reflects a real design that is in development now is unclear. TWZ has reached out to NASA for more information.

Though the Mach-3+-capable SR-71 is primarily remembered as a Cold War-era intelligence-gathering aircraft, NASA operated several Blackbirds in support of aeronautical research efforts for years. The agency was actually the last operator of the type, flying SR-71s until 1999.

Lockheed Martin openly pitched a successor to the SR-71, dubbed the SR-72, in the late 2010s. There was even talk of building a flying fighter jet-sized demonstrator to prove out key technologies.

Discussion about the SR-72, or a further evolution of that concept, resurfaced in the early 2020s after Lockheed Martin helped craft a fictional hypersonic aircraft called Darkstar for the blockbuster movie Top Gun: Maverick.

Exactly where Lockheed’s SR-72 ambitions sit today is unclear. After talking constantly about the potential program for a number of years, it went silent, which could indicate the program had moved forward deep in classification.

NASA has worked with other supersonic and hypersonic X-planes in the past, as well. This includes reusable space planes, as well as aircraft designed to fly within the Earth’s atmosphere.

“I mean, that doesn’t seem like a space vehicle. It seems like an Earth-air vehicle,” All-In’s Palihapitiya noted during his chat with Isaacman about the silhouette he showed.

“Yeah. The first ‘A’ in NASA is our aeronautics portfolio,” Isaacman said in response, before highlighting a host of contributions his agency has made to advanced military and commercial developments over the years. “You know what I want to do? I want to get back to the radical airframe and engine designs like we were always supposed to do.”

As mentioned, Isaacman also highlighted the X-59 Quiet Supersonic Technology experimental test aircraft, or QueSST, at the summit, but made clear the goal is to go well beyond that design. The QueSST jet is the centerpiece of a program now to investigate technologies that could eventually enable commercial supersonic flight over land with a substantially reduced sonic boom.

The X-59 conducted its first supersonic test flight, reaching Mach 1.1, in June. NASA’s test program aims to eventually push the aircraft up to a speed of Mach 1.4. This is significantly below the record-breaking mark of approximately Mach 3.3 that the SR-71 clocked back in the mid-1970s, but it was never designed for extreme speed as testing its sonic signature was its primary goal.

As for bringing a Blackbird back into operation for high-speed testing, which is now at the forefront of military aeronautics (and civilian to a lesser degree) after decades of being sidelined, that would be a very challenging operation. The SR-71s are long retired and have been placed in museums and other display areas. While the Pentagon could technically claw some of them back from their ‘on loan’ status, reconstituting even one of them would be a major undertaking as the entire support ecosystem that once sustained them has been gone for decades. Still, having a Mach 3+ capable jet for testing would be a highly relevant tool in a new age of high-speed flight exploration.

On the other hand, building a new test aircraft that aims higher and faster than the SR-71, but may be based on its ‘DNA,’ is certainly possible. Such an aircraft could leverage material science, avionics, flight controls, and engines that are seven decades more modern than its progenitor. Technology demonstrators in this class could also already exist in the classified domain. NASA could possibly assume ownership of one after the Pentagon declassifies it, as well.

Regardless of how such an exotic aircraft is obtained, one of the biggest differentiating factors could be that a NASA aircraft is piloted by a human onboard, instead of it being a drone, but an uncrewed aircraft is possible too.

Isaacman has been very open about its interest in and support for new X-plane developments. On only his second day on the job, in December of last year, he called for revamping the agency’s aeronautics program and stated that “I’d love to see an expanded X-plane portfolio” during a town hall with NASA staff.

“If NASA has a healthy X-plane portfolio, we should be flying experimental aircraft so routinely that the second flight of a single X-plane is not newsworthy,” he wrote in a post on X in March of this year. “For example, the two NASA X-29 aircraft flew 422 flights between 1984 and 1991. That period also overlapped with the development of two X-31 aircraft, which together flew about 580 times.”

NASA’s proposed FY2027 budget also spelled out rapid, cost-effective flight experimentation as an explicit priority. Budget documents specifically highlight work toward new advances in supersonic and hypersonic flight technologies “that will revolutionize air transportation, strengthen national security capabilities, and position America to lead the future of high-speed flight,” as well.

Furthermore, in April, NASA outlined a new Aeronautics Flight Accelerator (AFA) initiative. At that time, the agency put out a call for “input on technologies, concepts, and flight test campaigns suitable for cost shared maturation leading to flight within the next three years.” Stated areas of interest included “subsonic (including vertical lift), supersonic, and hypersonic flight technologies.”

It is important to reiterate that we still do not know whether the silhouette Isaacman showed at the All-In Summit represents an active development effort and, if so, how mature it might be. Government agencies and contractors routinely use concept art to illustrate an area of research or communicate a future vision. Such artwork does not necessarily correspond to a funded aircraft, an active prototype, or even a specific configuration.

At the same time, under Isaacman, NASA is clearly pushing toward new X-planes. NASA’s X-plane programs have historically served as a way to investigate technologies that conventional aircraft programs were not prepared to risk. The resulting aircraft have explored everything from supersonic and hypersonic flight to unconventional configurations and new propulsion concepts.

At the very least, evoking the visual legacy of the SR-71 Blackbird, coupled with Isaacman’s comments, provides a clear indication that NASA is interested in returning to the high-speed flight regime as part of its future plans.

Update: 2:04 PM ET –

NASA has now provided TWZ with the following statement in response to our queries for more information:

“NASA has a long history of building and flying experimental aircraft that push the boundaries of what is possible. As Administrator Isaacman has said, we want to see more X-planes flying in the years ahead, developing the technologies that will allow us to fly higher, farther, and faster than we have in decades. We look forward to sharing more as those efforts progress.“

Contact the author: thomas@thewarzone.com

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