Key Points and Summary – The X-44 MANTA was a radical, tailless derivative of the F-22 Raptor that promised extreme stealth, range, and agility by relying entirely on thrust vectoring.
-Killed by post–Cold War budgets, technical risk, and the shift to counterinsurgency and the F-35, it never left the drawing board.
U.S. Air Force service members from the 62nd Fighter Squadron, Luke Air Force Base, Ariz., conduct flight line operations in support of the F-35 Lightning II TDY, Oct. 28, 2021, at Joint Base San Antonio-Kelly Field, Texas. The 62nd FS will be training with F-16s from the 149th Fighter Wing and the 301st Fighter Wing, along with T-38s from the 301st Fighter Wing. The multi-role capabilities of the F-35 allows them to perform missions which traditionally required numerous specialized aircraft. The complimentary air superiority capabilities of the F-35 will augment our air superiority fleet and ensure we continue to “own the skies” over future battlefields. (U.S. Air Force photo by Brian G. Rhodes)
-Yet its ideas—tailless design, huge internal fuel, advanced flight controls—helped shape the Air Force’s Next Generation Air Dominance program.
-Today’s F-47 concept effectively fulfills what the X-44 hinted at: a sixth-generation air-superiority fighter built to dominate contested skies well beyond the Raptor’s limits, from the Pacific to any future peer war.
The X-44 Lives On In NGAD
In the late 1990s, the U.S. Air Force and NASA entertained an idea for a truly ambitious aircraft: the X-44 MANTA (Multi-Axis No-Tail Aircraft), a radical derivative of the F-22 Raptor designed to eliminate all vertical and horizontal tails and rely entirely on thrust-vectoring to maneuver.
The idea was to take the F-22’s airframe and stealth systems, then push them further in terms of agility, range, and radar-signature reduction.
While the ambitious concept showed promise, the X-44 never left the drawing board. So what happened?
What did the concept reveal about American air-dominance thinking at the time? And what might its cancellation tell us about fighter development priorities today?
What the X-44 MANTA Was Meant to Be
The X-44 MANTA first emerged around 1999 as a collaboration between the Skunk Works division of Lockheed Martin, NASA, and the Air Force.
It was envisioned as a streamlined evolution of the F-22. It featured the same twin-engine layout but employed a tailless delta-wing shape that relied entirely on thrust-vectoring for control.
The goal was to reduce radar cross-section to an extreme degree by eliminating all vertical stabilizers.
The design would reduce drag and general mechanical complexity, while also increasing space for internal fuel storage and weapons. It was a remarkable design that would solve sustainment issues while boosting range and lethality.
The delta wing was also intended to be stretched relative to that of the F-22, which would further increase fuel capability and combat radius. On paper, its performance metrics were impressive. The X-44 was expected to achieve a service ceiling of about 49,000 feet and a range of almost 2,000 miles, while flying at speeds of about Mach 2.
U.S. Air Force Capt. Nick “Laz” Le Tourneau, F-22 Raptor Aerial Demonstration Team commander, performs an aerial maneuver during the Hyundai Air and Sea show at Miami, Florida, May 25, 2025. The F-22 Aerial Demonstration Team highlights cutting-edge airpower, precision, skill, all while reinforcing public confidence in the Air Force’s ability to protect and defend. (U.S. Air Force photo by Staff Sgt. Lauren Cobin)
It wasn’t expected to be a production variant of the F-22, but the X-44 was conceived to build on the Raptor’s air-superiority role. Its advanced stealth and maneuverability might prefigure the sixth-generation aircraft currently being built and under development.
The MANTA was clearly a hybrid idea. It was part F-22 derivative, and partly a technology demonstrator. It was designed to test the viability of a radical tailless combat aircraft that utilized full thrust vectoring and stealth from the get-go; but it simply wasn’t meant to be.
Why It Never Happened
Despite its clear promise, there were multiple factors that killed the X-44 before it ever flew.
Budget and timing were chief among them. At the time, the U.S. defense budget was still coping with the post-Cold War draw-down. The F-22 program itself was facing cost overruns and political opposition, with its final production numbers eventually being capped at 187 aircraft. Introducing an even more advanced derivative of the platform would have required substantial new investment, and a huge amount of effort to convince lawmakers to get on board. That didn’t happen.
Then there’s the matter of technical risks. Removing all tail surfaces and relying solely on thrust vectoring was a fantastical idea. It was possible, but it was risky. While NASA and the Air Force had conducted preliminary feasibility studies, the level of thrust vectoring required, and the flight-control software the feat demanded, were still immature in the 1990s.
Without great software and advanced systems, the tailless design would be highly unstable, particularly at high angles of attack. That made the engineering risk high, which meant the design would only be entertained if the budget allowed. The budget did not allow.
Further, shortly after the concept was floated, the war on terror began, and the Department of Defense’s priorities changed. Focus moved toward counter-insurgency, unmanned systems, and multi-role platforms such as the F-35 Lightning II, rather than ultra-specialized air-superiority jets.
All of that was enough for the MANTA project to be canceled, but that doesn’t mean the project completely died. The design of the X-44 arguably influenced fighter research under the NGAD umbrella, meaning an X-44 demonstrator was never actually necessary.
In many ways, the X-44 will live on as the F-47.
F-47 Fighter from U.S. Air Force. Image Credit USAF.
NGAD. Image Credit. Lockheed Martin.
The funding for the X-44 was completely cut by 2000, and the project permanently shelved. There was no prototype. No test flights. The concept remained just that: a concept.
Nonetheless, the program indicated that such an aircraft was technically feasible. And after decades of additional experience and learning, the Next Generation Air Dominance program is delivering the F-47, which is expected to do much of what the X-44 promised—and then some.
About the Author:
Jack Buckby is a British author, counter-extremism researcher, and journalist based in New York. Reporting on the U.K., Europe, and the U.S., he works to analyze and understand left-wing and right-wing radicalization, and reports on Western governments’ approaches to the pressing issues of today. His books and research papers explore these themes and propose pragmatic solutions to our increasingly polarized society. His latest book is The Truth Teller: RFK Jr. and the Case for a Post-Partisan Presidency.
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