Can Boeing Starliner Become NASA’s Long-Term Crew Transportation System?

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Key Takeaways

• NASA is backing Starliner as a second U.S. crew system and a bridge to post-ISS destinations.
• An uncrewed Starliner-1 flight must validate propulsion fixes before astronauts return in 2028.
• Starliner’s long-term value depends on Vulcan certification, safety performance, demand, and price.

Why NASA Is Recommitting to Boeing Starliner

On September 28, 2026, NASA put Boeing Starliner back at the center of its long-term plans for transporting astronauts to low Earth orbit. The agency said it intends to exercise options for a fifth and sixth Starliner flight, support certification of United Launch Alliance’s Vulcan rocket for crew transportation, and proceed first with an uncrewed Starliner-1 mission. The decision does not mean Starliner is certified for regular astronaut service. It establishes a pathway intended to get the spacecraft there.

The timing matters because NASA’s Commercial Crew Program was created around the principle of having more than one U.S. transportation provider. SpaceX’s Crew Dragon achieved certification in 2020 and has since become NASA’s operational U.S. crew transportation system. Starliner has yet to reach the same status.

NASA is therefore pursuing two tracks. On September 18, it awarded SpaceX three additional crew missions designated Crew-15, Crew-16, and Crew-17. The modification is worth $946 million and extends SpaceX’s Commercial Crew Transportation Capability contract through 2030. Ten days later, NASA outlined a longer-term Starliner strategy.

NASA Administrator Jared Isaacman added another reason during the September 28 briefing. He said SpaceX intends eventually to sunset Falcon and Dragon as the company concentrates on Starship. NASA has not announced a fixed date on which Dragon will cease NASA crew operations, and its newly purchased missions demonstrate that Dragon remains central to near-term planning. The agency is nevertheless planning for a transportation architecture that cannot assume Dragon will remain available indefinitely.

That creates an important distinction. Starliner is no longer simply a backup spacecraft for the International Space Station. If Boeing completes certification and SpaceX later retires Dragon, Starliner could become one of the few available U.S. systems designed specifically for routine astronaut transportation to low Earth orbit. NASA has also indicated that it would welcome additional providers, meaning Starliner is not being designated as a permanent exclusive provider.

The strategy is closely connected to the larger commercial space logistics market. Crew transportation, cargo delivery, station operations, launch services, communications, insurance, training, and ground infrastructure become increasingly interdependent as NASA shifts more low-Earth-orbit activity toward commercially supplied services.

NASA’s decision is therefore about more than recovering a delayed spacecraft program. It is an attempt to prevent the United States from entering the next phase of low-Earth-orbit commercialization with only one mature transportation architecture and no assured successor.

What Starliner-1 Must Prove Before Astronauts Return

Starliner’s path back to astronaut service runs through the failures and anomalies encountered during its 2024 Crew Flight Test. NASA astronauts Butch Wilmore and Suni Williams launched aboard Starliner in June 2024, but propulsion-system problems changed the mission substantially. NASA ultimately decided to return the spacecraft without its crew. Wilmore and Williams remained aboard the International Space Station and returned to Earth aboard a SpaceX Crew Dragon in March 2025.

NASA subsequently conducted a formal Program Investigation Team review. In February 2026, the agency released its investigation findings and classified the Crew Flight Test as a Type A mishap, NASA’s highest mishap classification. The investigation produced 61 recommendations covering technical problems as well as program management, organizational decision-making, and safety processes.

The propulsion problems were particularly important. NASA found that Starliner’s service-module reaction control thrusters operated beyond their engineering qualification environment. Extensive ground testing subsequently showed that the failures were associated with the thermal environment and elements of the thruster design. NASA and Boeing also investigated helium leakage and a separate crew-module thruster problem.

Boeing has made thermal modifications to the service module that NASA intends to evaluate during Starliner-1. NASA also plans a further service-module thruster valve modification aimed at addressing poppet seal extrusion, a condition that can adversely affect thruster performance. Additional work includes new crew-module thrusters, batteries, parachute modifications, and operational changes intended to increase reliability.

This makes Starliner-1 much more than a routine cargo flight. NASA describes it as an engineering evaluation mission. The spacecraft is expected to perform targeted demonstrations and collect propulsion and thermal-performance data that will contribute to the final qualification of systems needed for crewed flight.

The current launch window is December 2026 or January 2027. That timing remains conditional on spacecraft and launch readiness. NASA plans to use the resulting flight data before completing remaining corrective actions and crew certification.

NASA’s present objective is to return astronauts to Starliner with Starliner-2 in 2028. Astronaut Woody Hoburg has been selected as commander. Hoburg previously served as pilot of SpaceX Crew-6 and spent more than 185 days aboard the International Space Station.

The sequence is deliberately evidence-driven: modify the spacecraft, fly it without astronauts, examine actual flight performance, finish the remaining redesign and qualification work, and only then authorize a crewed mission. A successful Starliner-1 flight would therefore represent an important milestone, but it would not by itself establish that the entire system is ready for astronauts.

Why Vulcan Matters to Starliner’s Future

Solving Starliner’s spacecraft problems addresses only part of the transportation system. Boeing also needs a launch vehicle capable of carrying Starliner after the Atlas V rockets allocated to the program are exhausted or become unavailable.

Starliner was developed around United Launch Alliance’s Atlas V. Atlas V is no longer in production, leaving a finite inventory of previously manufactured rockets. NASA’s September announcement therefore includes work with Boeing and United Launch Alliance to certify Vulcan for Starliner missions after the final Atlas V flight.

This is a significant undertaking because a rocket that can successfully launch satellites is not automatically certified to carry people. Human-rating requires NASA and its contractors to demonstrate that the complete transportation system satisfies applicable safety, reliability, monitoring, abort, structural, operational, and mission-assurance requirements for crewed missions.

Starliner and Vulcan must also work as an integrated system. Boeing said during the September briefing that the effort includes a new launch-vehicle adapter, aerodynamic work, loads analysis, and certification activities. NASA must evaluate the combined launch vehicle and spacecraft rather than treating either vehicle independently.

The new work also changes the economics of continuing Starliner. NASA officials said the spacecraft improvements and Vulcan certification effort represent about $359 million in additional government support. That figure should not be compared directly with the $946 million modification for three additional SpaceX missions because the two expenditures purchase different things. One buys complete Dragon transportation missions; the other supports corrective work and another launch system’s certification.

Vulcan certification is particularly relevant to the broader in-space economy. A transportation system intended to operate beyond the International Space Station needs a launch architecture that can continue into the commercial-station era rather than depend on a discontinued rocket.

The result is effectively a second certification challenge layered on top of Starliner’s spacecraft certification. Boeing and NASA must demonstrate that the spacecraft’s propulsion problems have been resolved sufficiently for crewed operations, and the Starliner-Vulcan combination must eventually demonstrate that it satisfies NASA’s requirements for human spaceflight.

That makes Vulcan one of the most important factors in Starliner’s long-term usefulness. Even a fully corrected spacecraft would have limited strategic value without a sustainable launch system.

How the Post-ISS Market Changes Starliner’s Business Case

NASA’s Starliner decision also has to be understood in the context of the International Space Station’s approaching transition. NASA and most of its major international partners are planning to operate the station through 2030, followed by a transition toward commercially owned and operated destinations in low Earth orbit.

NASA’s commercial station strategy is based on changing the government’s role. Instead of owning and operating the principal U.S. orbital station, NASA intends eventually to purchase services from commercial destinations, becoming an important customer rather than the sole owner of the infrastructure.

That transition creates a transportation problem as well as a station-development problem. A commercial station needs reliable ways to move astronauts, private customers, cargo, equipment, experiments, and supplies between Earth and orbit. Transportation availability can therefore influence whether the commercial station market becomes economically sustainable.

The relationship between transportation and station development is examined in New Space Economy’s analysis of the commercial station competition and the possibility of a low-Earth-orbit capability gap. A station that is ready before dependable transportation is available has a problem. A transportation provider without enough destinations and customers faces the opposite problem.

The market is also less settled than a simple 2030 transition date can suggest. As of October 2, 2026, NASA’s official commercial destination procurement page still stated that no final Commercial Low Earth Orbit Destination Contract solicitation existed. NASA had released draft materials, a September 4 pre-solicitation notice, and subsequent question-and-answer updates, but the eventual procurement, award structure, station schedules, and commercial demand remain subject to change.

That uncertainty matters to Boeing. NASA can provide an anchor level of demand, but a sustainable Starliner business beyond the ISS would benefit from additional customers and destinations. The same applies to competing crew transportation systems.

New Space Economy’s examination of low Earth orbit commercialization highlights the underlying economic issue: infrastructure providers cannot depend indefinitely on development subsidies and government commitments. They eventually need repeatable service demand.

Starliner could therefore become more valuable as the space economy expands, but that outcome depends on certification, pricing, schedule reliability, compatible destinations, and actual customer demand. A technically successful spacecraft is a prerequisite for that market, not proof that the market will develop at the expected scale.

The Strategic Trade-Off: Redundancy, Competition, and Cost

The strongest strategic argument for continuing Starliner is redundancy. The strongest caution is that redundancy has a cost, particularly when the second system has required substantial additional engineering and oversight.

NASA experienced the consequences of limited U.S. crew transportation options after the Space Shuttle retired in 2011. Until Crew Dragon entered service, NASA relied on Russia’s Soyuz spacecraft for routine astronaut transportation to the International Space Station. NASA’s Office of Inspector General has reported that the agency paid as much as $90 million for individual Soyuz seats during that period.

Commercial Crew was designed partly to change that structure by supporting competing U.S. providers. SpaceX achieved operational status first. Boeing’s delays have meant that the intended two-provider system has not yet existed in sustained operational practice.

A June 2026 commercial crew audit from NASA’s Office of Inspector General noted that Crew Dragon had already flown 12 crewed missions to and from the station by the time of the audit, whereas Starliner remained uncertified. The office also documented recurring schedule, technical, oversight, and payment concerns involving Boeing’s program.

A September 2026 OIG assessment placed the combined Commercial Crew contracts awarded to Boeing and SpaceX at more than $8 billion, excluding additional resources subsequently contributed by NASA and the companies. The Inspector General again emphasized the economic and operational value of having multiple transportation choices.

There is no guarantee that preserving Starliner will automatically preserve long-term competition. If Dragon eventually retires before another U.S. crew vehicle is certified, Starliner could temporarily become the only operational U.S. capsule available for the role. Conversely, if Starliner does not achieve certification on the planned schedule, NASA could remain dependent on Dragon longer than anticipated or face pressure to find another solution.

NASA has made clear that it wants more providers, not fewer. Isaacman said during the September briefing that projected NASA demand is approximately one crewed low-Earth-orbit mission every six months and invited additional commercial providers to pursue that market.

The decision to continue Starliner can therefore be understood as an option-preservation strategy. NASA is spending additional money today in an attempt to retain a second pathway for future crew transportation. Whether that spending produces an economically competitive service will depend on evidence that does not yet exist.

The most informative milestones will be Starliner-1’s actual flight performance, closure of the Program Investigation Team recommendations, completion of the remaining thruster redesign, Starliner-2 certification, progress toward human-rating Vulcan, and the emergence of commercial destinations that can generate repeat transportation demand.

Summary

NASA’s September 2026 Starliner announcement represents a significant change in the program’s strategic importance. Boeing’s spacecraft was originally one of two Commercial Crew systems intended to provide competition and redundancy for International Space Station transportation. Years of technical difficulties left SpaceX Crew Dragon as the operational U.S. crew system. NASA is now trying to restore the two-provider concept at the same time that it prepares for a post-ISS commercial market and the eventual evolution of SpaceX’s transportation architecture.

The plan remains conditional. Starliner-1 must demonstrate that thermal and propulsion changes perform as intended. Additional hardware modifications and certification work must follow. NASA currently plans a crewed Starliner-2 mission in 2028, and Vulcan must eventually be human-rated if Starliner is to continue after Atlas V.

The program’s economic significance may ultimately extend beyond the ISS. Commercial stations will require reliable transportation, and NASA expects to remain a substantial customer in low Earth orbit. A certified Starliner could give station operators and government customers another transportation option.

The next decisive evidence will come from flight data rather than program announcements. Starliner-1 will test whether Boeing and NASA have sufficiently understood the spacecraft’s technical problems. Starliner-2 will test whether that understanding can be converted into a certified crew transportation service. Vulcan certification and commercial-station development will then determine whether Starliner can become a durable part of the post-ISS economy rather than a system whose useful life ends with the station it was originally designed to serve.

Appendix: Useful Books Available on Amazon

• Liftoff: Elon Musk and the Desperate Early Days That Launched SpaceX
• Reentry: SpaceX, Elon Musk, and the Reusable Rockets That Launched a Second Space Age
• Escaping Gravity: My Quest to Transform NASA and Launch a New Space Age
• The Space Barons: Elon Musk, Jeff Bezos, and the Quest to Colonize the Cosmos
• When the Heavens Went on Sale: The Misfits and Geniuses Racing to Put Space Within Reach

Appendix: Top Questions Answered in This Article

What Is Boeing Starliner?

Boeing Starliner is a reusable crew spacecraft developed under NASA’s Commercial Crew Program to transport astronauts between Earth and low Earth orbit. It consists of a reusable crew module and a disposable service module. NASA originally selected Starliner alongside SpaceX Crew Dragon so the agency could develop more than one U.S. commercial transportation option.

Is Starliner Certified for Regular NASA Astronaut Missions?

No. As of October 2, 2026, Starliner had not completed NASA certification for regular crew rotation missions. NASA plans to conduct an uncrewed Starliner-1 engineering mission before completing additional modifications, qualification work, and certification activities required for the planned Starliner-2 crewed mission.

When Could Starliner-1 Launch?

NASA says the uncrewed Starliner-1 mission could launch in December 2026 or January 2027. The schedule is conditional on vehicle and mission readiness rather than a guaranteed launch date. NASA intends to use the mission to evaluate thermal modifications, propulsion performance, operational controls, and other changes under actual flight conditions.

Will Starliner-1 Carry Astronauts?

No. Starliner-1 is planned as an uncrewed engineering evaluation mission to the International Space Station. Removing astronauts from the flight allows NASA and Boeing to test important modifications and collect performance data before exposing a crew to the redesigned system.

When Could Astronauts Fly on Starliner Again?

NASA’s current plan calls for astronauts to return aboard Starliner-2 in 2028. NASA astronaut Woody Hoburg has been selected to command that mission. The schedule depends on a successful Starliner-1 mission, completion of remaining corrective actions, qualification testing, and NASA approval of the spacecraft for crewed operations.

What Went Wrong During the 2024 Crew Flight Test?

The mission experienced propulsion-system anomalies that included service-module reaction control thruster failures and helium leaks. NASA later determined that the service-module thrusters had operated outside their qualified engineering environment, with thermal conditions and design characteristics contributing to the problem. NASA returned Starliner without its crew and subsequently classified the event as a Type A mishap.

Why Does Starliner Need the Vulcan Rocket?

Starliner was designed to launch on United Launch Alliance’s Atlas V, but Atlas V is no longer being manufactured. Only a limited inventory remains. NASA therefore wants to certify Vulcan as Starliner’s future launch vehicle so the spacecraft can continue operating after the available Atlas V rockets reach the end of their usable service.

How Many Starliner Missions Does NASA Plan?

NASA announced its intention to restore or exercise options associated with fifth and sixth Starliner flights, and agency leadership has discussed a potential series of as many as five crewed missions beginning with Starliner-2. Later missions are not equivalent to fully authorized flights, however. Their execution will depend on certification progress, transportation requirements, schedules, and future contracting decisions.

Why Does NASA Want More Than One Crew Transportation Provider?

Multiple providers can reduce dependence on a single spacecraft or launch system. If one vehicle is grounded by a technical problem, another may preserve access to low Earth orbit. Competition can also create pressure on pricing and service quality, although those benefits depend on having multiple qualified providers that can actually compete for missions.

Could Starliner Fly to Commercial Space Stations?

Potentially. NASA explicitly identifies future commercial destinations as part of Starliner’s intended long-term role. Reaching that market will require successful spacecraft certification, a sustainable launch system such as human-rated Vulcan, compatible commercial stations, and sufficient demand from NASA, station operators, private astronauts, international partners, or other customers.

Appendix: Glossary of Key Terms

Commercial Crew Program

NASA initiative created to develop privately operated U.S. spacecraft and launch systems for transporting astronauts to and from low Earth orbit. NASA purchases transportation services from commercial providers rather than owning every major component of the crew transportation system.

Low Earth Orbit

The region of space relatively close to Earth where the International Space Station and many satellites operate. Low Earth orbit, commonly abbreviated LEO, is expected to host commercial stations and other privately operated infrastructure as governments purchase more services from industry.

Reaction Control Thruster

A small rocket thruster used to change a spacecraft’s orientation or make relatively small trajectory adjustments. Starliner uses reaction control thrusters during important phases of flight, making predictable thruster performance necessary for safe rendezvous, docking, departure, and other spacecraft operations.

Service Module

The portion of Starliner that provides major support functions such as propulsion, electrical power, thermal management, and other systems during orbital operations. Unlike the crew module, the service module is not designed to be recovered and reused after a mission.

Human-Rating

The engineering, testing, certification, operations, and risk-management process used to establish that a spacecraft or launch system meets defined requirements for carrying people. A launch vehicle’s successful uncrewed missions do not by themselves establish that it is human-rated.

Commercial Low Earth Orbit Destination

A privately owned or commercially operated orbital facility intended to host government, research, industrial, international, or private customers. NASA plans to purchase services from such destinations as part of its transition away from owning and operating the International Space Station.