Commercial Aviation
Boom Supersonic Tests Symphony Engine at Colorado Facility
Boom Supersonic leverages Colorado’s aerospace infrastructure to test its SAF-compatible Symphony engine, collaborating with industry leaders for 2025 development milestones.
Boom Supersonic Chooses Colorado for Symphony Engine Testing: A Strategic Leap in Aviation
Supersonic flight is no longer just a nostalgic nod to the Concorde era, it’s fast becoming a cornerstone of next-generation aviation. Boom Supersonic, a company at the forefront of commercial supersonic travel, has taken a significant step forward by selecting the Colorado Air and Space Port (CASP) as the testing site for its Symphony engine. This move signals not only a technical milestone but also a strategic investment in sustainable, high-speed air travel.
The Symphony engine, designed specifically for Boom’s Overture airliner, represents a new paradigm in propulsion: efficient, quiet, and compatible with sustainable aviation fuel (SAF). By repurposing a former hypersonic testing facility, Boom is accelerating development while optimizing costs, an approach that reflects both innovation and pragmatism in an industry known for high barriers to entry.
Historical and Strategic Significance of the Colorado Facility
The site Boom has chosen is steeped in aerospace history. Previously used by Reaction Engines for testing the SABRE engine precooler, the facility was instrumental in achieving Mach 3.5 test conditions and managing extreme heat through rapid air cooling. Though Reaction Engines ceased operations at the site in 2024, the infrastructure remained, offering a rare opportunity for Boom to capitalize on existing high-performance test capabilities.
By adapting this legacy infrastructure, Boom avoids the significant capital expenditure of building a new test center from scratch. According to CEO Blake Scholl, this decision results in cost savings exceeding 50% compared to leasing government facilities. It also aligns with Boom’s vertically integrated development strategy, which aims to reduce external dependencies and streamline engineering workflows.
Located just 35 miles from Boom’s Denver headquarters, the facility offers logistical advantages that enhance coordination between design, testing, and manufacturing teams. As Boom prepares to scale Symphony’s development, the proximity of this site becomes a key operational asset.
“By leveraging an existing facility, we’ve created the first privately-owned supersonic test center at a fraction of the cost of government leases.” , Blake Scholl, CEO, Boom Supersonic
Economic and Regional Impact
The decision to invest up to $5 million in the Colorado site has implications beyond aviation. Lynn Baca, Chair of the Adams County Board of Commissioners, emphasized the potential for job creation and regional economic development. The project is expected to attract skilled labor and stimulate ancillary industries such as aerospace manufacturing and data analytics.
Jeff Kloska, Director of CASP, echoed this sentiment, noting that Boom’s presence helps position the spaceport as a hub for next-generation aerospace innovation. This aligns with Colorado’s broader ambitions to become a national leader in aviation and space technologies.
From a policy perspective, the partnership between Boom and CASP also showcases how public-private collaborations can accelerate technological progress while delivering tangible economic benefits to local communities.
Technical Advancements of the Symphony Engine
The Symphony engine is a medium-bypass turbofan specifically engineered for sustained supersonic performance. At takeoff, it delivers 35,000 pounds of thrust and is optimized to cruise at Mach 1.7, enabling transatlantic flights in under four hours. This performance is achieved without afterburners, a traditional source of inefficiency and noise in supersonic engines.
Measuring 12 feet in length and 4 feet in diameter, the engine’s core includes the high-pressure compressor, combustor, and turbine. This compact yet powerful configuration is designed to withstand the thermal and mechanical stresses of supersonic flight while maintaining fuel efficiency and environmental compliance.
Symphony is also engineered for compatibility with 100% sustainable aviation fuel. This feature addresses one of the key criticisms of supersonic travel, its environmental footprint, by reducing lifecycle carbon emissions and enabling cleaner operations at high altitudes.
Collaborative Engineering and Manufacturing
Boom is not working alone. The Symphony engine is a collaborative effort involving several key industry players. Florida Turbine Technologies is spearheading aerodynamic design and compressor development, while GE Aerospace (Colibrium Additive) contributes expertise in additive manufacturing for turbine components.
Final assembly will be handled by StandardAero in San Antonio, Texas. This division of labor allows Boom to leverage specialized capabilities without compromising its vertically integrated approach. Each partner brings decades of experience to the table, ensuring that Symphony benefits from cutting-edge engineering and manufacturing practices.
By integrating these partnerships into a cohesive development strategy, Boom enhances its ability to meet aggressive timelines and regulatory requirements. The result is a propulsion system that is not only technically advanced but also scalable for commercial production.
Testing Timeline and Future Developments
The Colorado facility is undergoing a comprehensive upgrade to support Symphony’s development. Investments include SAF-compatible fuel systems, advanced data acquisition platforms, and a state-of-the-art control room. These enhancements are designed to support two key phases of testing: core evaluation in late 2025 and full-engine prototyping in 2026.
During the first phase, Boom will test the high-pressure spool under simulated supersonic conditions. This will provide critical data on thermal performance, fuel efficiency, and mechanical durability. In the second phase, the complete engine, including bypass ducts and low-pressure turbines, will be integrated and tested for thrust and acoustic performance.
These tests are essential for refining the Symphony engine before it enters production. They also provide the foundation for regulatory certification and commercial deployment, which Boom aims to achieve by the end of the decade.
“This partnership advances our goal of establishing CASP as a global hub for next-generation aviation technologies.” , Jeff Kloska, Director, Colorado Air and Space Port
XB-1 Demonstrator and Overture Orders
Complementing Symphony’s development is Boom’s XB-1 demonstrator aircraft, which successfully broke the sound barrier six times in early 2025. These flights validated key aerodynamic and control systems, including force-feedback sidesticks and touchscreen cockpit interfaces.
The data from XB-1 is directly informing the design of the Overture airliner, which will carry 64–80 passengers and is slated for commercial service by 2029. With 130 orders from major carriers like United Airlines, American Airlines, and Japan Airlines, the commercial appetite for supersonic travel is clear.
These pre-orders represent approximately five years of production at Boom’s Overture Superfactory in Greensboro, North Carolina, further underscoring the market viability of the Symphony-powered aircraft.
Conclusion
Boom Supersonic’s decision to establish its Symphony engine test facility in Colorado is a calculated and forward-thinking move. It leverages existing infrastructure, fosters regional economic growth, and accelerates the development of a propulsion system poised to redefine commercial aviation. The Symphony engine, with its emphasis on speed, sustainability, and system integration, represents a new chapter in aerospace innovation.
Looking ahead, the success of this initiative will depend on rigorous testing, regulatory approvals, and continued advancements in sustainable aviation fuel. If Boom can meet these challenges, it may well usher in a new era of fast, efficient, and environmentally responsible air travel, bringing supersonic flight back to the commercial mainstream.
FAQ
What is the Symphony engine?
Symphony is a medium-bypass turbofan engine designed by Boom Supersonic for its Overture airliner. It is optimized for sustained supersonic flight and compatible with 100% sustainable aviation fuel.
Why did Boom choose the Colorado Air and Space Port?
Boom selected the site for its existing hypersonic testing infrastructure, cost efficiency, and proximity to the company’s headquarters in Denver.
When will Symphony engine testing begin?
Core testing is scheduled to begin in late 2025, with full-engine prototyping planned for 2026.
What airlines have ordered the Overture aircraft?
United Airlines, American Airlines, and Japan Airlines have placed a combined 130 orders and pre-orders for the Overture.
Sources: Aerospace Testing International, Boom Supersonic, Airframer, Aviation Pros, Travel Industry Wire
Photo Credit: BoomSupersonic
Aircraft Orders & Deliveries
KKR Commits $1.4 Billion to Altavair Aircraft Leasing
KKR announces a $1.4 billion equity commitment to expand commercial aircraft leasing with Altavair, deepening an eight-year partnership.
Global investment firm KKR announced a $1.4 billion equity commitment on June 17, 2026, to expand its commercial aircraft leasing portfolio in partnership with Altavair. The capital injection targets airlines seeking liquidity and fleet flexibility amid rising global air travel demand and upcoming fleet funding requirements.
In a press release issued jointly from New York and Seattle, the companies confirmed the new funding will be sourced primarily from KKR’s Infrastructure and Asset-Based Finance strategies. The commitment deepens an eight-year strategic partnership between the two firms, which was formalized in 2018.
Scaling the KKR and Altavair partnership
Since aligning in 2018, KKR-managed funds have committed $8 billion to aircraft leasing and lending transactions alongside Altavair. The joint venture has acquired 188 commercial aircraft and engine assets, which are currently leased to 67 airline and cargo operators globally.
Brandon Freiman, Partner and Head of North American Infrastructure at KKR, stated that nearly a decade of partnership has deepened the firm’s conviction in the aircraft leasing market.
“Nearly a decade of strategic partnership with Altavair has deepened our conviction in the attractiveness of aircraft leasing, which we believe is poised to grow even further as demand for air travel continues to rise and airlines seek more liquidity and fleet flexibility,” Freiman said.
Altavair’s historical footprint and market position
Altavair has maintained a significant presence in commercial aviation leasing and financing since its inception in 2003. The company has completed commercial aircraft lease transactions valued at $14.5 billion, representing 300 individual Boeing and Airbus aircraft. Over its history, Altavair has transacted with 80 airline customers across 50 countries.
Steve Rimmer, Chief Executive Officer of Altavair, noted that airlines face substantial fleet funding needs in the coming years. He indicated the expanded commitment positions the company to support the broader aviation ecosystem.
“Our strategic partnerships with KKR has grown stronger over the past eight years, and this latest commitment reflects the trust we have built together,” Rimmer said. “KKR’s expertise, and long-term capital have helped build Altavair into the platform it is today.”
Broader aviation investment strategy
KKR began its major investment push into the aviation sector in 2015. Since that time, the firm has invested a total of $12 billion across the broader aviation industry. The latest $1.4 billion commitment highlights a growing trend of alternative asset managers providing capital to the commercial aviation sector.
Daniel Pietrzak, Partner and Global Head of Private Credit at KKR, attributed the success of the partnership to combining long-term capital with Altavair’s industry expertise and sourcing capabilities.
AirPro News analysis
We view KKR’s continued capital injection into Altavair as a clear indicator of private equity’s expanding role in commercial aviation finance. The press release notes that airlines face significant upcoming fleet funding requirements. As operators navigate these capital demands, alternative asset managers are increasingly providing the necessary liquidity. The $1.4 billion commitment ensures Altavair retains the ready capital to execute leasing transactions, which remain a critical tool for airlines requiring fleet flexibility to meet rising global passenger demand.
Sources: Business Wire
Photo Credit: KKR
Aircraft Orders & Deliveries
Boeing 737 MAX 7 and MAX 10 FAA EASA Certification 2026
FAA and EASA near final certification of Boeing 737 MAX 7 and MAX 10, with deliveries targeted for 2027.
The FAA and the European Union Aviation Safety Agency (EASA) are in the final stages of certifying the Boeing 737 MAX 7 and MAX 10 variants, clearing the path for commercial deliveries to begin in 2027. Regulators provided the update on June 17, 2026, during a safety conference in Chantilly, Virginia, signaling the end of a long-delayed approval process for the final two models of the 737 MAX family.
According to Reuters, the MAX 7 is on track to receive FAA certification in the summer of 2026, with the larger MAX 10 expected to follow before the end of the year. The regulatory progress allows The Boeing Company to stabilize its production system and prepare to fulfill extensive order backlogs for major launch customers, including Southwest Airlines (WN) and United Airlines (UA).
Certification progress and technical milestones
The certification timeline has accelerated following the resolution of a key technical hurdle. Reuters reported that Boeing successfully addressed the engine anti-ice system redesign, an issue that had previously pushed FAA approval for both variants into 2026. With that engineering challenge resolved, the aircraft have completed approximately 80 percent of their flight-test programs.
The manufacturer does not require any further Type Inspection Authorizations to proceed. EASA Executive Director Florian Guillermet noted the positive momentum during the Chantilly conference. He stated that the agencies are making excellent progress on closing out final actions, adding that completing the process soon will allow the industry to move forward.
Production rate increases and regulatory relations
As certification nears, Boeing is scaling up its manufacturing output. The company recently passed an FAA capstone review, which permits an increase in the 737 MAX production rate from 42 to 47 aircraft per month. Boeing President and CEO Kelly Ortberg confirmed the milestone on May 27, 2026, noting that the Everett assembly line is now transitioning to the 47-jet monthly rate in preparation for 2027 deliveries.
The coordinated progress between US and European regulators highlights a shift in international aviation oversight. Following years of heightened scrutiny and tension stemming from the 2018 and 2019 Boeing 737 MAX crashes, relations between the FAA and EASA have stabilized. Guillermet recently characterized the two agencies as trustful partners, reflecting a more unified approach to certifying Boeing’s final MAX variants.
AirPro News analysis
We view the synchronized messaging from the FAA and EASA as a critical indicator of regulatory alignment. The explicit timeline for summer and late 2026 certifications suggests that the technical data packages submitted by Boeing have met the stringent requirements imposed after previous MAX groundings. For Boeing, achieving the 47-aircraft monthly production rate is just as vital as the certifications themselves. The manufacturer must demonstrate it can scale operations safely to meet the delivery expectations of Southwest and United in 2027 without triggering further regulatory intervention.
Sources: Reuters
Photo Credit: Boeing
Commercial Aviation
Airbus Cancels AirAsia X Order for 15 A330-900 Aircraft
Airbus confirms mutual cancellation of 15 A330-900s with AirAsia X as the group shifts to A220-300 and A321XLR narrowbodies.
This article summarizes reporting by The Star.
Airbus SE has officially removed 15 A330-900 aircraft from its backlog following a mutual agreement with Malaysia-based AirAsia X Berhad to cancel the outstanding order. The cancellation, confirmed by the manufacturer on June 17, 2026, marks a definitive end to the long-haul low-cost carrier’s previous widebody expansion strategy.
According to reporting by The Star, an Airbus spokesperson confirmed the mutual cancellation in a statement to the Malaysian National News Agency (Bernama). The adjustment was formally reflected in the European manufacturer’s May 2026 orders and deliveries data. AirAsia X declined to provide an official comment regarding the cancellation.
Strategic shift toward narrowbody operations
The cancellation of the A330-900 order aligns with a broader fleet restructuring across the AirAsia Group. The company is pivoting away from widebody aircraft in favor of long-range narrowbodies and smaller regional jets to serve its future network requirements.
In May 2026, AirAsia placed a firm order for 150 Airbus A220-300 aircraft. The group also recently committed to 50 Airbus A321-200NY(XLR) aircraft, according to ch-aviation. These acquisitions indicate a preference for lower-capacity, longer-range airframes to optimize route economics.
Network adjustments and delayed hub launch
Alongside the fleet changes, AirAsia X is modifying its near-term network expansion plans. The carrier recently postponed the launch of its planned hub at Bahrain International Airport (BAH).
The airline had intended to utilize the Bahrain hub for fifth-freedom flights connecting Kuala Lumpur International Airport (KUL) to London Gatwick Airport (LGW) starting in June 2026. Due to concerns regarding the ongoing conflict in the Middle East, ch-aviation reports that the launch has been delayed until August or September 2026.
AirPro News analysis
We view the formal cancellation of the A330-900 order as the final step in AirAsia X’s post-pandemic restructuring. By abandoning the high-capacity widebody model in favor of the A321XLR and A220-300, the airline group is prioritizing flexibility and lower trip costs over sheer passenger volume. The A321XLR will allow AirAsia X to maintain its long-haul low-cost model on thinner routes that could not profitably sustain an A330-900. Concurrently, the delayed Bahrain hub launch demonstrates a cautious approach to international expansion amid geopolitical volatility.
Sources: The Star, Airbus Orders and Deliveries, ch-aviation, Airbus Press Release
Photo Credit: Airbus
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