secretive

NASA is moving to hire a contractor to assess whether or not a Boeing 737-73W can meet its needs for a new reduced-gravity testbed aircraft. The use of planes modified for this role is now new, and they are often called “Vomit Comets” because of the extreme maneuvers they perform to simulate zero-G environments and the physical side effects this often induces. However, there’s an unusual twist here with the specific plane that NASA is now eyeing: it currently belongs to the U.S. Air Force and is part of a “classified military program.” There is a strong possibility that the aircraft in question is a mysterious 737 that the service acquired in 2020, and that has been the subject of much speculation as to its purpose ever since.

NASA’s Armstrong Flight Research Center posted a contracting notice yesterday justifying a planned sole-source contract to Denmar Technical Services, Inc. in relation to “Reduced Gravity Modification” of the 737-73W aircraft. Earlier this year, signs had already emerged that NASA might be in line to get a heavily modified and highly secretive 737 from the Air Force, designated the NT-43A and commonly referred to by the callsign RAT55. However, yesterday’s notice does not appear to refer to the NT-43A, long used as an airborne signature measurement platform and described in the past as the world’s most secretive 737, which is based on a much older 200-series airframe. We will come back to this later on.

What NASA wants now

“NASA requires Denmar Technical Services, Inc. to conduct a feasibility assessment to determine the Boeing 737-73W’s suitability to perform the NASA reduced gravity mission; modify the aircraft cabin, if required, to support reduced gravity operations; perform overdue maintenance and inspections, perform airworthiness restoration tasks, and paint the aircraft exterior with NASA identifiers,” the contracting notice NASA released yesterday explains.

The notice adds that the aircraft, if modified, would be used, at least most immediately, “for the Reduced Gravity Test Bed Project in support of the agency [sic] need for performing validation testing on Space Suits in support of the Artemis program.”

Artemis is NASA’s current effort to return U.S. astronauts to the lunar surface. The Artemis II mission, conducted in April, involved the first fly-by of the Moon by a crewed spacecraft since the end of the Apollo program in the early 1970s. However, the spacecraft did not touch down on the surface. The goal now is for a crewed lunar landing to come in 2028. RAT55 was notably used to support the launch of the Artemis II mission and the subsequent recovery of the capsule after its return to Earth.

Back in January, NASA had put out a separate contracting notice calling for information about new options to provide “parabolic flight services” to simulate “reduced gravity environments, including microgravity” for testing and scientific research purposes. The Florida-based Zero-G corporation is currently the primary provider of these services to NASA, using a retrofitted Boeing 727-200 dubbed ‘G-Force One.’ You can read more about NASA’s general use of Vomit Comets in the context of that notice here.

Total Weightless! What Happened on my Zero Gravity Flight?

The Boeing 737-73W under consideration to be turned into a Vomit Comet “is owned by the United States Air Force (USAF). Denmar Technical Services, Inc. has specialized knowledge of this Boeing 737-73W aircraft as they are currently contracted by the USAF to modify the aircraft under a classified military program,” the contracting notice NASA released yesterday adds. “NASA does not have a ‘need to know’ regarding the details of the current modifications being made under the USAF contract and therefore is unable to provide modification details to another contractor or provide another contractor with access to the aircraft. The USAF will transfer ownership of the aircraft to NASA upon completion of the closeout tasks.”

“Denmar Technical Services, Inc. is uniquely positioned to close out work under their existing obligations while performing the feasibility assessment, maintenance, and any modifications required under this action,” the notice continues. “Additionally, due to the constrained timeline for the NASA Extravehicular Activity and Human Surface Mobility Program’s space suit testing for Artemis, NASA requires the assessment and overdue maintenance to be performed immediately upon contract award and any subsequent aircraft modifications to be complete no later than October 1, 2026. The timeline can only be supported if this requirement is fulfilled concurrently with the USAF closeout tasks.”

Denmar is a small aviation firm headquartered in Reno, Nevada. At the time of writing, its website lists a wide array of specialized design, modification, flight testing, and other work among its portfolios. This includes “advanced customized mission system development” that “encompasses the design of unique airborne operator interfaces, specialized emitters and sensors, system integration, and post-mission analytics and processing.” The company also describes itself as the “Nation’s leading experts on IR [infrared] and RF [radiofrequency] survivability, signature modeling, [and] agile software development for analysis and real-world operational assessments.”

In line with all this, Denmar is understood to have been the prime contractor behind the extensive modifications to RAT55. In April, the Air Force confirmed to TWZ that the NT-43A was “being transitioned to start the next phase of its career,” as reflected by its involvement in the Artemis II mission, “after decades of flights supporting the Air Force in various roles.” The aircraft, which is understood to have long called the secretive and remote Tonopah Test Range Airport (TTR) in Nevada home, has been seen much more publicly since then.

However, as NASA’s recent contracting notice makes clear, the 737 it is now looking at as a potential Vomit Comet is a much newer 700-series model. TWZ has reached out to the Air Force and NASA for more information.

The curious case of N712JM

As mentioned, it is very possible, if not highly probable, that the 737 NASA is now considering turning into a Vomit Comet is one that the Air Force acquired in 2020, which TWZ explored in-depth at the time. That aircraft, which is a -73W model, is still officially on the U.S. civil register, with the registration code N712JM. Federal Aviation Administration (FAA) records show that the preceding owner of this aircraft was Denmar, which acquired it in 2019. The plane’s history before that is murky, with Boeing delivering it in 2013 to East West Bank via a trusteeship with Wells Fargo Bank, per the FAA’s records.

N712JM had drawn particular attention in 2020 not just because of its transfer to the Air Force, but also because it emerged at that time wearing a green protective coating and otherwise looking like it had just rolled off the production line. It also had some unusual external features that raised questions about its role, as we explored at the time.

In 2020, Jon Ostrower, long-time aviation journalist and editor-in-chief of The Air Current, told TWZ the following:

“This is definitely an airplane that never made it to a formal finish you’d expect from a commercial airplane. The green finish is a protective coating applied to fuselages during manufacturing to protect from scratches and other damage. It is dissolved during painting. You can also still see the manufacturing (line) number as well. That’s from its original trip down the assembly line. There’s also quite a bit of instrumentation visible with sensor wiring leading into the cabin through the passenger windows. This type of arrangement points to a flight test setup of some kind.”

In 2020, N712JM conducted many test flights in U.S. military ranges off the coast of Southern California, flying various flight profiles, some of them quite unusual. The aircraft flew those sorties from Santa Maria Airport in California, and used the callsign STING 38.

What the Air Force has been using N712JM for to date is unknown. Per FAA, the aircraft has been and continues to be registered to an address at Bolling Air Force Base (technically now part of Joint Base Anacostia-Bolling) in Washington, D.C., which looks to belong to the Air Force’s Rapid Capabilities Office (RCO). The RCO has headed up multiple cutting-edge, high-priority programs over the years, including the development of the B-21 Raider stealth bomber and the X-37B reusable spaceplane. A 737-based platform could be configured to support an array of different research and development and test evaluation activities that would fall under the purview of RCO, as well as other stakeholders that this office might engage with.

There has also been some speculation over the years that N712JM might have transformed into an Air Force 737 with the serial number 21-0024, but this appears to still be unconfirmed. The 21-0024 serial has more recently become associated with other shadowy 737s tied to the U.S. military, which have civilian-style paint schemes and may also be on the U.S. civil register. One of them was notably spotted in 2025 at a U.S. forward operating location in El Salvador, sitting directly alongside an Air Force AC-130J Ghostrider gunship and a U.S. Navy P-8A Poseidon maritime patrol plane. This, in turn, raised questions about its involvement in the ongoing U.S. campaign of strikes on alleged drug smuggling boats in the Caribbean and the Eastern Pacific Ocean, as TWZ previously explored in detail.

21-0024, for reference. When I spotted it, FR24 was indeed calling it N712JM, though ADSBx had the BuNo and a different hex. https://t.co/3WwV3kxBC4

— Volgowrath (@volgowrath) April 27, 2023

Sightings and flight tracking data have also pointed to N712JM being a resident at the Sierra Nevada Corporation’s (SNC) facility at Colorado Springs Airport, in the Colorado city of the same name, over the years. SNC is well known for highly specialized and unique aircraft modification work, especially for the U.S. military, but its exact connection to this 737 is unclear.

Interestingly, there have been several online flight tracking data ‘pings’ suggesting new activity related to N712JM at Colorado Springs Airport since at least February of this year. However, there do not appear to be any confirmed flights by the aircraft from there in that same timeframe. This airport notably sits adjacent to Peterson Space Force Base.

There is still a possibility that NASA could be looking at a different Air Force 737-73W for possible conversion into a Vomit Comet. As the contracting notice makes clear, the aircraft in question is currently in the classified realm. At the same time, this seems far less likely to be the case given everything that is known (and still unknown) about N712JM.

A separate question does exist now as to what effort the Air Force might be in the process of closing out that would allow it to transfer any classified 737 to NASA. TWZ has previously raised tangential questions about how the Air Force might fill the resulting gaps left by the highly-specialized RAT55 moving on to the next stage of its career. It is certainly interesting in its own right that NASA seems to be focused heavily at the moment on leveraging some of the most secretive 737s in existence today to support its much less sensitive needs.

More details may emerge if Denmar deems the “classified” Air Force 737 to be a suitable starting place to create a new Vomit Comet to support NASA’s reduced gravity training needs and the Artemis program.

Update: 3:45 PM EST –

In immediate response to our queries, NASA has directed us to an additional notice about the award of the sole-source contract, valued at $8.4 million, to Denmar Technical Services back on June 1.

“The contractor will modify a Boeing 737-700 aircraft to perform lunar-gravity parabolic flights to test NASA space equipment. Once modifications are complete, NASA Armstrong will own the aircraft and oversee aircraft operations out of NASA Johnson,” the notice says. “The aircraft will be used to validate astronaut lunar suits and associated crew systems required to support Artemis mission objectives. This can be done with the modified 737 aircraft in an operationally relevant, reduced-gravity environment prior to lunar mission execution.”

No mention is made here about the sourcing of the aircraft from the Air Force or its classified mission work, as outlined in the sole-source justification that was released yesterday.

Contact the author: joe@twz.com

The first picture of the U.S. military’s new AIM-260 Joint Advanced Tactical Missile (JATM) has emerged. Flight testing of the JATM is known to have started years ago, but it has never been seen publicly before now. The missile is expected to augment and ultimately replace the venerable AIM-120 Advanced Medium-Range Air-to-Air Missile (AMRAAM) in U.S. service.

Photographer Jonathan Tweedy took pictures of several U.S. Navy test jets departing Eglin Air Force Base in Florida on May 13. This included an F/A-18F Super Hornet from Air Test and Evaluation Squadron 31 (VX-31) carrying the AIM-260 on the fuselage station outboard of its right engine intake. The jet also has a modified FPU-13/A drop tank with an infrared search and track (ISRT) sensor on its centerline station, as well as flight data pods on its wingtips. The Aviationist was the first to publish Tweedy’s pictures of the VX-31 jet with the JATM.

Eglin is routinely used as a staging point for U.S. military aerial weapons testing, as well as other aviation research and development and test and evaluation work. The base is situated right next to extensive over-water ranges over the Gulf of Mexico, off the coast of the Florida panhandle.

When it comes to the AIM-260, Tweedy’s picture confirms the design is very minimalist, at least externally, with only four fins at the tail. Unlike the AIM-120, it has no mid-body control surfaces, or even strakes running along the sides. The JATM’s overall configuration reflects optimization for maximum speed and range.

The JATM in this case looks to have a live high-explosive warhead, as indicated by a yellow band at the front end of the body. There are also two black bands toward the rear, which could point to the location of the missile’s rocket motor.

The nose cone has a distinct light gray color compared to the rest of the predominantly white body. There are square markings at various points at the rear of the body, which are often seen on aerial munitions and aircraft during testing to help with visual tracking, as well.

Overall, the AIM-260 seen in Tweedy’s pictures looks entirely in line with what had previously been depicted in official renderings of the JATM, both in terms of its design and markings.

The Navy is developing the AIM-260 in cooperation with the Air Force. In the past, officials have explicitly cited the growing reach of Chinese air-to-air missiles, and the PL-15 in particular, as key drivers behind the JATM program. China continues to develop and field more capable air-to-air missiles, as you can learn more about this past TWZ feature. A boost in maximum range is therefore known to be a central requirement for the AIM-260, which is reportedly designed to hit targets out to at least 120 miles, if not further.

Another known requirement for the AIM-260 is to have a form factor that is roughly the same as the AIM-120, making it easier to integrate on existing aircraft. Details about the JATM otherwise remain limited. As TWZ has previously written:

“An advanced rocket motor with highly loaded propellant has long been seen as a likely route to give the AIM-260A significantly greater range, as well as speed, over the AIM-120 without making the new missile larger. A core known requirement for the JATM is that it has to have the same general form factor as the AMRAAM, in large part to ensure that it can fit inside the internal bays on stealth fighters like the F-22 and the F-35 Joint Strike Fighter. In addition to crewed aircraft, AIM-260As are expected to arm future stealthy drones like the ones under development under the Air Force’s Collaborative Combat Aircraft (CCA) program.”

…

“The AIM-260A’s rocket motor is also likely to be a dual-pulse design that retains energy across the flight envelope to further extend range and help dramatically with endgame maneuverability. Thrust vectoring capability would also be a requisite to give the missile sufficient agility in the absence of additional control surfaces.”

…

“An active electronically scanned array radar (AESA) seeker is likely. Multi-mode seeker capability, potentially with imaging infrared and passive radiofrequency (RF) guidance capabilities, could be extremely valuable in the face of an ever-expanding countermeasure ecosystem, although we have no idea if this is a feature now or not. It’s also possible it could be introduced in later variants. Advanced networking capabilities would be a key feature, allowing the missile to get additional targeting information from an array of third party sources. This is especially imported for engaging targets beyond the reach of the launch platform’s own sensors and it can allow the aircraft firing the missile, especially a stealthy one, to avoid having to switch on its radar and increase its vulnerability to detection as a result. Multiple networked JATMs might even be able to prosecute engagements cooperatively.”

Overall, the JATM program, which traces back to at least 2019, remains largely classified. As noted, flight testing of AIM-260 has been underway for some time and has already included multiple live-fire shots. There has also been movement in recent years to get the missile into production and fielded operationally.

Navy Super Hornets, along with U.S. Air Force F-22 Raptors, are expected to be the first types to fly operationally armed with AIM-260s. The missiles will surely be integrated onto a host of other aircraft, including the Air Force’s future F-47 and whatever design the Navy might choose to become its sixth-generation F/A-XX fighter.

What the projected timeline might be for the AIM-260 entering operational service now is unclear. When the program first emerged publicly in 2019, the goal was for the missiles to be fielded in 2022. There were reports late last year that JATM had suffered a new three-month delay due to funding issues, based on a fact sheet distributed by some members of the U.S. House Committee on Armed Services. However, the committee subsequently said that the information was incorrect.

As an aside, the Navy announced back in 2024 that it had begun limited fielding of another, different very-long-range air-to-air missile, the AIM-174B, which is derived from the surface-launched Standard Missile-6. The AIM-260 is expected to be complementary to the AIM-174B, as you can read more about here and check out our video below.

How The Navy’s New Very Long-Range AIM-174 Will Pierce China’s Anti-Access Bubble

The first public sighting of an AIM-260 this week certainly points to new progress toward finally fielding this new air-to-air missile.

Special thanks again to Jonathan Tweedy for sharing the pictures of the AIM-260 on the VX-31 Super Hornet with us.

Contact the author: joe@twz.com

Satellite imagery has emerged showing China’s two massive stealthy flying-wing high-altitude, long-endurance (HALE) unmanned aircraft at its secretive test base near Malan. TWZ first identified both of the previously unseen aircraft last year in Planet Labs archived imagery of the airfield, which is known to be on the leading edge of the PLA’s unmanned combat aircraft development efforts. However, this is the first time both have been captured outside their hangars simultaneously, or on the main apron at all. Overall, the image, dated March 26th, 2026, underscores the major uptick of very advanced drone testing activity at the installation.

The flying wing with the longest wingspan (red arrow in the image at the top of the article), which some have dubbed “WZ-X,” and what we refer to as “The Monster of Malan,” is parked on the main apron next to the runway. The very large flying wing has a span of approximately 173 feet — roughly the width of a B-2 Spirit stealth bomber. You can read more about this impressive aircraft in our previous coverage here and here. Other details about its true designation or its manufacturer remain unknown.

The second large flying wing (green arrow) is seen in the image sitting outside a hangar that is part of the sprawling new high-security facility on the opposite side of the complex. It features a ‘cranked kite’ planform with a wingspan of approximately 137 feet, although it would appear to have a significantly higher gross weight and likely lower operating ceiling than its wider stablemate. Based on our previous analysis, this variant is suited for the intelligence, surveillance, and reconnaissance (ISR) role, but could also work as a supersized unmanned combat air vehicle (UCAV) capable of performing very long-range heavy strike missions.

Both of these aircraft appear to have been flying now for a number of months. You can read about this here and here.

There is also what appears to be a stealth fighter-like drone (orange arrow) and a Xi’an Y-20 transport plane on the main apron in the image.

China has shown off a very large number of fighter-drone concepts, very loosely similar to the U.S. Collaborative Combat Aircraft initiative, in recent years. A Chinese military parade in 2025 was really Beijing’s major public thrust into this area of advanced fighter-like drone development. Since then, testing of at least one configuration has been ramped up considerably.

Just reviewing Planet Labs archived images of Malan in recent months shows the aircraft configuration seen above to be very active at the base. This relatively large unmanned ‘fighter’, analogous to a manned light-to-medium weight fighter in size, is a tailless design that features a very similar planform as the J-XDS 6th generation manned fighter. It also appears similar in shape to another CCA-like aircraft that has been photographed flying.

One drone shown off during China’s big military parade looks very similar to it, in particular. But regardless, this general design appears to be a focus of testing at the base.

Other mysterious aircraft have appeared at the installation as well, which is clearly set up specifically to run many programs within its high-security confines at any given time.

Beijing is actively pursuing a range of flying-wing drones of various sizes, including large HALE drones, designed to perform a diverse set of missions, including ISR and strike. For many years, TWZ has assessed that this was an area of the Chinese aviation industry most likely to see an explosion of investment. The WZ-X is still the largest Chinese design in terms of wingspan that we have seen in this category to date. The cranked-kite design is certainly the heaviest.

This new look at China’s two large flying wing combat drones comes as we got our first good look at America’s own RQ-180 HALE stealth drone, which has been flying for some time and is now being used operationally. It also comes as China is rushing ahead on all fronts with its next generation air combat ecosystem, and making impressively quick progress to show for its efforts. Still, a formidable looking aircraft doesn’t mean it can fight as impressively as part of a joint force as it looks, or survive against enemy air defenses. Regardless, China is clearly betting substantially on advanced and large unmanned flying wing designs.

Contact the author: ian.ellis-jones@teamrecurrent.io