Space & Satellites
NASA and Boeing Modify Starliner Contract to Prioritize Safety
NASA and Boeing reduce Starliner missions and shift next flight to uncrewed cargo to fix propulsion issues ahead of crewed launches.

Strategic Adjustments to the Commercial Crew Program
On November 24, 2025, NASA and Boeing announced a significant modification to the Commercial Crew Transportation Capability (CCtCap) contract. This decision marks a pivotal shift in the operational timeline for the Starliner spacecraft, reflecting a prioritized focus on safety and technical validation over immediate crew deployment. The modification formally reduces the definitive order of Starliner missions from six to four, converting the remaining two missions into options that NASA is not currently obligated to exercise. This contractual restructure allows both parties to recalibrate their resources as they address the technical hurdles encountered during previous flight tests.
The most immediate operational change resulting from this modification concerns the next scheduled flight, designated Starliner-1. Originally planned as the first operational mission to ferry a full complement of astronauts to the International Space Station (ISS), Starliner-1 has been re-designated as an uncrewed cargo-only flight. This mission is now targeted for launch no earlier than April 2026. The shift to a cargo profile provides engineers with a critical opportunity to test system upgrades in a flight environment without risking human safety, a prudent step following the anomalies observed in earlier missions.
This development underscores the complexities inherent in certifying new human-rated spacecraft. The decision comes in the wake of the Crew Flight Test (CFT) conducted in June 2024, which successfully docked with the ISS but experienced propulsion issues that ultimately led to the spacecraft returning to Earth uncrewed. By adjusting the contract and mission profile, we see NASA and Boeing acknowledging that the path to certification requires further rigorous testing of the propulsion system’s modifications before regular astronaut rotation flights can commence.
Addressing Technical Anomalies and Engineering Solutions
The primary driver behind these contractual and operational changes lies in the technical performance of the Starliner’s service module. During the 2024 Crew Flight Test, the spacecraft experienced helium leaks and thruster failures during its approach to the space station. Subsequent investigations identified the root cause within the thruster pods, colloquially known as “doghouses.” These pods were found to be excessively insulated, which trapped heat during frequent firing pulses. This thermal buildup caused Teflon seals, or “poppets,” inside the oxidizer valves to expand and bulge, restricting oxidizer flow and leading to reduced thrust or complete failure.
To rectify these issues, Boeing has engineered specific modifications that will be validated during the uncrewed Starliner-1 mission in 2026. The engineering teams are reducing the insulation within the doghouses to facilitate better heat dissipation. Furthermore, operational flight rules are being updated to mitigate thermal stress. These changes include avoiding pointing the aft thrusters directly at the sun for extended periods and widening the “dead-bands”, the allowable drift limits before a thruster fires, to reduce the frequency of thruster pulses. The upcoming cargo flight serves as the final exam for these hardware and software adjustments.
The financial structure of the program also plays a role in the context of these delays. Boeing operates under a fixed-price contract originally valued at $4.2 billion. Unlike cost-plus contracts, where the government covers overruns, a fixed-price model requires the contractor to absorb additional costs associated with delays and technical fixes. As of late 2025, reports indicate that Boeing has recorded losses exceeding $2 billion on the Starliner program. Despite these financial headwinds, the company has reiterated its commitment to fulfilling the contract and ensuring the spacecraft meets NASA’s stringent safety standards.
“This modification allows NASA and Boeing to focus on safely certifying the system in 2026, execute Starliner’s first crew rotation when ready, and align our ongoing flight planning for future Starliner missions based on station’s operational needs through 2030.”, Steve Stich, Manager, NASA Commercial Crew Program.
Implications for the ISS and Future Operations
The timeline adjustments for Starliner have broader strategic implications for the management of the International Space Station. NASA’s original goal for the Commercial Crew Program was to establish “dissimilar redundancy”, having two independent American spacecraft capable of reaching the ISS. This ensures that if one vehicle is grounded due to technical issues, the other can maintain access to the station. With Starliner’s operational debut pushed to late 2026 or 2027, NASA remains reliant on SpaceX’s Crew Dragon for the immediate future, extending a period of single-provider dependence that the agency had hoped to end sooner.
Furthermore, the operational window for Starliner is narrowing relative to the lifespan of the ISS. The station is currently scheduled for deorbiting around 2030. If Starliner begins regular crew rotations in 2027, it will have a service life of approximately three to four years before the station’s retirement. This compressed timeline likely influenced the decision to convert the final two missions of the original six-mission contract into options. Fulfilling four operational missions within the remaining years of the ISS program is a tight schedule, making the execution of six missions increasingly unlikely.
Looking ahead, the successful completion of the uncrewed Starliner-1 mission in April 2026 is the critical gatekeeper for the program’s future. If the propulsion system upgrades perform as designed, NASA intends to certify the spacecraft for human flight shortly thereafter. This would pave the way for Starliner-2 to serve as the first operational crew rotation mission. While the road has been longer and more complex than anticipated, the rigorous adherence to safety protocols demonstrates that NASA and Boeing are prioritizing the well-being of future crews above schedule pressures.
Concluding Perspectives
The modification of the NASA-Boeing contract represents a pragmatic recalibration of the Commercial Crew Program. By converting the next flight to a cargo-only mission and reducing the total number of guaranteed launches, the agency and the aerospace giant are adapting to technical realities rather than forcing a schedule that could compromise safety. The focus remains squarely on validating the fixes to the propulsion system, specifically the thermal management of the thruster pods, to ensure that Starliner can reliably transport astronauts.
As we look toward 2026, the industry will be watching the Starliner-1 cargo mission closely. Its success is essential not only for Boeing to recoup its investment and restore confidence in the vehicle but also for NASA to finally achieve the redundant crew access to low-Earth orbit that has been a strategic priority for over a decade. The path forward is defined by a commitment to engineering rigor, ensuring that when Starliner flies crew again, it is fully ready for the task.
FAQ
Question: Why was the Starliner contract modified?
Answer: The contract was modified to address technical issues discovered during the 2024 Crew Flight Test. NASA and Boeing agreed to reduce the number of firm missions and convert the next flight into an uncrewed cargo mission to validate propulsion system upgrades without risking crew safety.
Question: When is the next Starliner launch?
Answer: The next mission, Starliner-1, is targeted for launch no earlier than April 2026. It will be an uncrewed cargo flight to the International Space Station.
Question: What technical issues are being fixed?
Answer: Engineers are addressing overheating issues in the “doghouse” thruster pods, which caused Teflon seals in the oxidizer valves to expand and fail. Fixes include reducing insulation and altering flight rules to minimize thermal stress.
Sources
Photo Credit: NASA
Space & Satellites
Isar Aerospace Spectrum Rocket Reaches Orbit From Norway
Isar Aerospace’s Spectrum rocket became the first privately developed European launch vehicle to reach orbit on Sept. 5, 2026.

German commercial space company Isar Aerospace successfully launched its Spectrum rocket into orbit from Andøya Spaceport in northern Norway on September 5, 2026, marking the first time a privately developed European launch vehicle has reached orbit.
In a press release issued following the launch, Isar Aerospace confirmed the two-stage rocket lifted off at 20:12 UTC and successfully deployed five commercial and educational CubeSats, along with one experimental payload, into Low Earth Orbit (LEO). The mission, designated “Onward and Upward,” establishes a critical new domestic launch capability for Europe following a period of restricted access to space.
Overcoming previous setbacks and securing funding
The successful flight follows the loss of the first Spectrum rocket during its maiden test flight on March 30, 2025. That mission, named “Going Full Spectrum,” failed approximately 30 seconds after liftoff due to an unintended vent valve opening that resulted in a loss of attitude control.
Following the 2025 anomaly, Isar Aerospace focused on vehicle modifications and scaling operations. In June 2026, the company closed a €270 million Series D funding round to drive global scaling and serial production of the Spectrum vehicle. The successful September 2026 Launch followed multiple scrubbed attempts earlier in the year due to valve issues, weather constraints, and range violations by unauthorized vessels.
European Space Agency support and payload details
The Space-Agencies (ESA) supported the mission through its Boost! program, which aims to foster commercial space transportation services in Europe. ESA Director General Josef Aschbacher praised the milestone in an official statement.
“A historic launch from Andøya Spaceport in Norway today, the first European Launcher Challenger to reach orbit… Spectrum quite literally rose to the challenge and delivered its payloads in low Earth orbit. An astounding achievement by German company Isar Aerospace, founded only eight years ago, and backed by the European Space Agency. This is yet another step towards a more diverse autonomous European launch service sector, and I am excited for what is still to come!”
The 28-meter-tall, 2-meter-diameter Spectrum rocket is powered by 10 engines and is designed to carry up to 1,000 kilograms to LEO. For this flight, the vehicle carried payloads from European universities and commercial entities, including:
- CyBEEsat (TU Berlin)
- TriSat-S (University of Maribor)
- Platform 6 (EnduroSat)
- FramSat-1 (NTNU)
- SpaceTeamSat1 (TU Wien Space Team)
- Let It Go experiment (Dcubed)
Strategic implications for European spaceflight
The launch from Andøya Spaceport represents the first successful orbital launch from Western European soil. Historically, European orbital launches have been conducted from the Guiana Space Centre in French Guiana or relied on international partners.
Géraldine Naja, ESA Director of Space Transportation, noted the shifting landscape in an official statement, stating that the European space transportation sector is undergoing an incredible transformation as new actors develop vehicles alongside traditional launchers.
AirPro News analysis
We view the success of the Spectrum rocket as a pivotal moment for the European aerospace sector. The continent has faced a well-documented capability gap following the retirement of the Ariane 5, delays in the Ariane 6 program, and the loss of access to Russian Soyuz vehicles. Isar Aerospace’s successful deployment of payloads demonstrates that Europe’s commercial space industry can deliver viable, autonomous access to Low Earth Orbit for small and medium payloads, reducing reliance on international launch providers.
Sources: Isar Aerospace
Photo Credit: Isar Aerospace
Commercial Space
Dawn Aerospace Aurora Spaceplane to Support Astral Materials
Dawn Aerospace will conduct up to 100 microgravity flights for Astral Materials using the Aurora spaceplane from Oklahoma starting 2028.

Astral Materials has selected Dawn Aerospace to conduct up to 100 microgravity test flights using the Aurora spaceplane to accelerate the development of next-generation semiconductor manufacturing hardware. The campaign, announced on September 1, 2026, will operate out of the Infinity One Oklahoma Spaceport in Burns Flat, Oklahoma.
In a press release issued on September 1, 2026, Dawn Aerospace detailed the agreement, which leverages the rapid reusability of the Aurora spaceplane to provide high-cadence microgravity testing. Astral Materials plans to use these flights to refine its microgravity furnace hardware. The system is designed to reduce gravity-driven defects, such as convection and sedimentation, during the growth of semiconductor crystals. These materials have potential applications in photonics, quantum computing, and high-power electronics.
Rapid iteration in suborbital flight
The Aurora spaceplane is designed to reach a top speed of Mach 3.7 and a maximum altitude of 100 kilometers, providing payloads with up to 127 seconds of microgravity per flight. According to the manufacturers, the vehicle supports a four-hour turnaround time between flights. This operational tempo allows researchers to conduct multiple tests within a single day.
Astral Materials Chief Technology Officer Jiya Janowitz highlighted the value of this cadence for hardware development, noting that payloads can be recovered in approximately 45 minutes.
“We can test an idea, recover it in around 45 minutes, make an adjustment on the ground and test it again later that same day. That kind of rapid iteration has never existed for microgravity manufacturing, and it fundamentally changes how quickly we can develop our technology.”
Astral Materials Chief Executive Officer Dr. Jessica Frick stated that the Aurora spaceplane provides a practical pathway to validate manufacturing systems before scaling to commercial production in orbit, where longer-duration microgravity is available.
Commercial operations and Oklahoma infrastructure
Commercial flight operations for the Astral Materials campaign are slated to begin in 2028 at the Infinity One Oklahoma Spaceport. The Oklahoma Space Industry Development Authority (OSIDA) welcomed the partnerships in an official social media statement on September 1, 2026, emphasizing the state’s focus on attracting high-cadence commercial spaceflight operations.
This agreement follows an April 16, 2026, announcement in which Dawn Aerospace and OSIDA launched the Suborbital Spaceplane Challenge. That initiative offered United States researchers up to 25 flights aboard the Aurora spaceplane to stimulate utilization of the Oklahoma facility.
Dawn Aerospace Chief Executive Officer Stefan Powell noted that routine access is required to transition microgravity manufacturing from a scientific curiosity to a viable industry, comparing the need for rapid experimentation to previous industrial revolutions.
AirPro News analysis
The partnership between Dawn Aerospace and Astral Materials highlights a critical gap in the current space manufacturing ecosystem. While orbital platforms like the International Space Station offer long-duration microgravity, the cost and lead times associated with orbital launches prohibit the rapid trial-and-error necessary for hardware development. Suborbital spaceplanes like Aurora serve as an essential stepping stone. By providing brief but frequent periods of microgravity, these vehicles allow companies to validate complex systems before committing to expensive orbital deployments.
We note a minor discrepancy in Dawn Aerospace’s published materials regarding the commencement of operations at the Oklahoma site. The main announcement targets 2028 for commercial flights, while the company’s boilerplate text references 2027. Regardless of the exact start date, establishing a reliable suborbital testbed will be vital for the commercial viability of in-space manufacturing applications.
Sources: Dawn Aerospace
Photo Credit: Dawn Aerospace
Space & Satellites
NASA X-59 Completes 25th Flight, Enters Acoustic Validation
NASA’s X-59 quiet supersonic aircraft finished initial envelope expansion and moves to acoustic validation for the Quesst mission.

The National Aeronautics and Space Administration (NASA) X-59 quiet supersonic experimental aircraft completed its 25th test flights on August 21, 2026, validating aerodynamic models and clearing the way for the program’s critical acoustic validation phase.
In a press release issued on September 4, 2026, the agency confirmed the milestone marks the conclusion of initial envelope expansion for the centerpiece of the Quesst mission. The X-59 is designed to cruise faster than the speed of sound while producing a muted sonic thump rather than a disruptive sonic boom. Data collected during the upcoming flight phases will be shared with U.S. and international regulators to inform new noise thresholds, which could eventually lead to the lifting of the ban on commercial supersonic flight over land.
Flight envelope expansion and performance
During the 72-minute test flight originating from NASA’s Armstrong Flight Research Center in Edwards, California, the X-59 reached a speed of Mach 1.2 and an altitude of 49,000 feet. The flight followed a rapid envelope expansion campaign over the summer. The aircraft achieved its first supersonic flight on June 5, 2026, and reached its target cruise conditions of Mach 1.4 (924 mph) and 55,000 feet on June 12, 2026.
NASA Test Pilot Nils Larson described the test flights as “exciting but uneventful,” noting that the aircraft “likes to fly fast.”
The initial 25 flights focused on proving the airworthiness and baseline performance of the unique airframe, which was built by prime contractor Lockheed Martin and powered by a General Electric GE-F414 engine.
“Through our ongoing flight tests with the X-59, we’ve gained invaluable insights into both the aircraft’s performance and the unique challenges of the aircraft design,” said Cathy Bahm, Project Manager for the NASA Low Boom Flight Demonstrator project. “Each test point has validated our models and predictions, and it has strengthened our confidence in the aircraft’s performance.”
Transitioning to acoustic validation
With baseline performance established, the Quesst mission will now shift focus to measuring the sound produced by the aircraft. During the acoustic validation phase scheduled for later this year, NASA will utilize ground- and air-based tools to measure the sonic thumps generated by the X-59 at supersonic cruise speeds.
The objective is to verify that the physical aircraft meets the low-boom design targets established by computer modeling.
“This is the phase we’ve been working toward,” said Larry Cliatt, Acoustic Validation Technical Lead for the NASA Quesst mission. “Building and flying a brand-new aircraft is an extraordinary accomplishment, but the next phase is where the real research begins.”
Cliatt noted that the acoustic validation campaign will be complex and demanding. The tools and methods used to design the X-59 will be put to the test, potentially forming the foundation for future commercial supersonic aircraft development.
AirPro News analysis
The successful completion of the X-59’s initial flight test phase marks a pivotal transition for the Quesst mission. We view the upcoming acoustic validation phase as the true test of the program’s value to the broader aerospace industry. While building a supersonic demonstrator is a significant engineering feat, the X-59 is fundamentally a data-gathering tool. If the acoustic measurements match NASA’s models, the agency will possess the empirical evidence required by the Federal Aviation Administration (FAA) and the International Civil Aviation Organization (ICAO) to establish noise-based certification standards. Establishing these standards is the mandatory first step toward opening overland routes to a new generation of commercial supersonic aircraft.
Sources: NASA Quesst Blog
Photo Credit: NASA
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