The Defense Advanced Research Projects Agency is channeling tens of millions of dollars into Aurora Flight Sciences for two experimental aircraft programs that together could redefine how the U.S. military builds and flies its next generation of X-planes. The paired investments in the CRANE and SPRINT programs signal a deliberate push toward aircraft that abandon conventional flight-control surfaces and take off vertically, capabilities that would give combat aviation a fundamentally different profile than anything currently in service.
A $41 Million Bet on Unconventional Flight Control
In a contract action dated December 2023, the Department of Defense awarded Aurora Flight Sciences a modification worth $41,421,422 designated P00006 to contract HR001123C0012 for the CRANE program. CRANE, which stands for Control of Revolutionary Aircraft with Novel Effectors, is DARPA’s effort to design an X-plane that maneuvers through the air without relying on traditional hinged surfaces such as ailerons, rudders, or elevators. Instead, the program explores active flow control and other techniques that alter airflow directly over the aircraft’s skin or through embedded actuators.
The size of this single modification is telling. At more than $41 million for one contract action on an ongoing effort, the funding level suggests DARPA has moved well past paper studies and into hardware development or detailed design work. Contract modifications of this scale typically fund wind-tunnel campaigns, subsystem fabrication, or integration testing, all steps that precede a flyable demonstrator. The fact that Aurora is the named performer also narrows the competitive field. While DARPA often funds multiple companies in early program phases, a modification this large to one contractor implies a down-select has already occurred and that Aurora’s design has become the reference configuration for the program’s next stage.
CRANE’s technical ambition is matched by its potential operational payoff. Active flow control could allow designers to sculpt cleaner airframes with fewer gaps and hinges, improving both stealth and aerodynamic efficiency. By modulating jets of air or small embedded effectors along the wings and fuselage, an aircraft could generate roll, pitch, and yaw moments without ever moving a flap. For combat aircraft, that would reduce mechanical complexity and open up new shapes that are difficult to achieve with conventional control systems.
SPRINT Phase 1B and the Vertical-Takeoff Dimension
Separately, the Department of Defense documented a contract modification for Aurora Flight Sciences under the SPRINT program, specifically for Phase 1B work referencing broad agency announcement HR001123S0031. SPRINT, which stands for Speed and Runway Independent Technologies, targets aircraft that can take off and land vertically yet still fly at high subsonic or transonic speeds, a combination that has eluded designers for decades.
The Phase 1B designation indicates the program has passed initial concept evaluation and entered a stage where designs are refined and risk-reduction testing begins. Broad agency announcements like HR001123S0031 are the mechanism DARPA uses to solicit proposals across industry and academia before selecting performers. Aurora’s selection as the named performer for this phase means the company’s technical approach survived that competitive screening and is now being matured under government funding.
For military planners, the appeal of SPRINT is straightforward. Fixed-wing jets need long runways, and those runways are easy targets for precision missiles. An aircraft that can operate from a parking lot, a ship deck, or a stretch of highway while still reaching fighter-like speeds would dramatically reduce the vulnerability of forward-deployed air power. That operational logic has grown sharper as potential adversaries field larger arsenals of ballistic and cruise missiles designed to destroy airfields in the opening hours of a conflict.
SPRINT also tackles a long-standing trade-off in aviation. Traditional vertical-lift aircraft, such as helicopters or tiltrotors, sacrifice top speed and range to gain runway independence. High-performance jets, by contrast, deliver speed and payload but are tied to large bases. By aiming for runway independence at high subsonic or transonic speeds, SPRINT is testing whether that trade space can be reshaped, yielding aircraft that no longer fit neatly into existing categories.
Why Aurora Holds Both Cards
Aurora Flight Sciences, a Boeing subsidiary specializing in autonomous systems and advanced aircraft, is now the named performer on both CRANE and SPRINT. That dual role is unusual. DARPA programs typically draw from a broad pool of contractors, and having one company lead two related X-plane efforts concentrates technical knowledge in a single organization. The arrangement suggests either that Aurora’s proposals were substantially stronger than competitors’ bids, or that DARPA sees value in having one team explore the intersection of novel flight control and vertical-takeoff propulsion.
The two programs share a common thread: both seek to eliminate design constraints that have defined military aircraft for decades. CRANE removes the mechanical complexity and radar signature of movable control surfaces. SPRINT removes the dependence on prepared runways. If the technologies mature on parallel timelines, a future aircraft could combine both capabilities into a single airframe, producing a fighter or strike platform that is stealthier, more agile, and deployable from almost anywhere.
That convergence is not guaranteed. Experimental programs frequently produce useful technology that migrates into other platforms rather than yielding a single production aircraft. But the contract record shows DARPA is at least funding both lines of inquiry through the same company, which lowers the barriers to cross-pollination between the two efforts. Engineers working on CRANE’s flow-control algorithms, for example, can share insights with colleagues wrestling with SPRINT’s vertical-lift challenges, shortening learning cycles on both sides.
What Traditional Coverage Gets Wrong
Most reporting on DARPA X-plane contracts treats each announcement as an isolated procurement event, a dollar figure attached to a program acronym. That framing misses the strategic pattern. The CRANE and SPRINT contracts are not random line items. They represent a coherent investment thesis: that the next useful military aircraft will not be an incremental improvement on existing fighters but a departure from the design grammar that has governed combat aviation since the 1950s.
The assumption that future air superiority will come from faster or more maneuverable versions of current aircraft types is the dominant view in defense procurement. DARPA’s X-plane spending challenges that assumption directly. By funding aircraft that control themselves through airflow manipulation rather than mechanical surfaces, and that launch without runways, the agency is testing whether an entirely different class of vehicle could outperform conventional designs in contested environments.
This is not an academic exercise. The contract values involved, tens of millions per modification on programs that have already passed initial phases, reflect a level of commitment that goes beyond exploratory research. DARPA is building toward flight demonstrations, not just publishing technical papers. Demonstrator flights, even if they never lead to production programs, tend to reshape design practices across the aerospace sector for years afterward.
Operational Stakes for the U.S. Military
The practical consequences of these programs extend beyond engineering novelty. If CRANE’s novel effectors work as intended, future aircraft could be built with fewer moving parts, reducing maintenance costs and increasing the percentage of time each jet is available for missions. Eliminating control surfaces also removes a significant source of radar reflection, potentially making stealth aircraft harder to detect without adding weight or cost to their radar-absorbing coatings.
SPRINT’s vertical-takeoff goal addresses a different but equally pressing problem. The U.S. military’s current fast jet fleet depends on a relatively small number of large, well-maintained airfields. In a conflict with a near-peer adversary, those bases would be targeted immediately. An aircraft that can disperse to improvised sites and still generate high-speed sorties would complicate enemy targeting and enable more flexible basing concepts, from distributed operations across islands to rapid deployments from austere locations.
Together, CRANE and SPRINT point toward a future in which combat aircraft are both less visible and less predictable. Instead of launching from known runways along familiar flight paths, they could emerge from unexpected locations with airframes that defy traditional radar signatures. Aurora Flight Sciences now sits at the center of that vision, carrying the responsibility, and the opportunity, to turn DARPA’s ambitious contracts into flying machines that change how air power is projected and defended.
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*This article was researched with the help of AI, with human editors creating the final content.
