Sustainable Aviation
Boom Supersonic’s XB-1: Revolutionizing Supersonic Travel

Boom Supersonic’s XB-1: Breaking the Sound Barrier and Reviving Supersonic Travel
On January 28, 2025, Boom Supersonic’s XB-1 made history by becoming the first civil aircraft in U.S. history to break the sound barrier. Achieving a top speed of Mach 1.1, the XB-1 demonstrated the potential for a new era of supersonic passenger travel. This milestone marks a significant step forward in aviation technology, paving the way for faster, more efficient air travel that could revolutionize the industry.
Supersonic flight, which involves traveling faster than the speed of sound (approximately 767 mph at sea level), has long been a goal of aviation pioneers. While military aircraft have achieved supersonic speeds for decades, civilian applications have been limited. The Concorde, a joint project between the U.K. and French governments, was the last commercial supersonic aircraft, retiring in 2003 due to high costs and environmental concerns. Boom Supersonic’s XB-1 represents a new chapter in this journey, showcasing the potential for private companies to lead the way in supersonic innovation.
The successful test flight of the XB-1 is not just a technical achievement but also a symbol of progress in aviation. By demonstrating the feasibility of supersonic travel for civilian use, Boom Supersonic has reignited interest in faster air travel, with the potential to reduce transatlantic flights to less than four hours and flights from San Francisco to Tokyo to just six hours. This article explores the significance of this milestone, the technology behind the XB-1, and the future of supersonic travel.
The XB-1 Test Flight: A Historic Achievement
The XB-1’s test flight took place at the Mojave Air and Space Port in California, where it achieved a speed of Mach 1.1 (approximately 844 mph) during its 34-minute flight. The aircraft performed three supersonic runs, each carefully monitored by engineers on the ground. This test flight was the culmination of years of research and development, showcasing the capabilities of Boom Supersonic’s in-house technologies.
One of the key innovations in the XB-1 is its use of carbon fiber composites, which reduce weight while maintaining structural integrity. The aircraft also features a digital stability augmentation system, an augmented reality vision system for landing visibility, and supersonic intakes that slow down supersonic air to subsonic speeds for conventional jet engines. These technologies not only enhance performance but also address some of the challenges faced by previous supersonic aircraft, such as wave drag and stability at high speeds.
During the test flight, engineers activated the “flutter excitation system” to test the airflow around the aircraft and ensure the integrity of its fuselage. The XB-1 also performed maneuvers to evaluate its handling and flying abilities at high speeds. These tests provided valuable data that will inform the development of Boom’s next-generation supersonic airliner, the Overture.
“XB-1’s supersonic flight demonstrates that the technology for passenger supersonic flight has arrived. A small band of talented and dedicated engineers has accomplished what previously took governments and billions of dollars.” — Blake Scholl, Founder and CEO of Boom Supersonic
The Future of Supersonic Travel: The Overture
The success of the XB-1 test flight brings Boom Supersonic closer to its ultimate goal: the development of the Overture, a supersonic passenger airliner designed to carry 64 passengers. The Overture aims to start regular commercial operations in the 2030s, offering faster travel times and a more sustainable approach to supersonic flight. American Airlines and Japan Airlines have already placed orders for the aircraft, signaling strong industry interest.
One of the key challenges for supersonic travel has been its environmental impact. The Concorde, for example, faced criticism for its high fuel consumption and noise levels. Boom Supersonic is addressing these concerns by incorporating advanced materials and efficient engine designs into the Overture. The use of carbon fiber composites reduces weight, while the aircraft’s aerodynamic design minimizes drag and noise. Additionally, the Overture is being designed to run on sustainable aviation fuels, further reducing its environmental footprint.
The Overture’s development is being guided by the data collected from the XB-1 test flights. Engineers are using this information to refine the design and ensure the aircraft meets safety and performance standards. The Overture is expected to reduce transatlantic flight times to less than four hours, making it a game-changer for long-distance travel.
Challenges and Opportunities in Supersonic Aviation
While the XB-1’s success is a major milestone, the path to commercial supersonic travel is not without challenges. One of the primary concerns is regulatory approval. Supersonic aircraft must meet strict noise and emissions standards, which can be difficult to achieve while maintaining high speeds. Boom Supersonic is working closely with regulators to address these issues, but it remains a significant hurdle.
Another challenge is the cost of development and operation. Supersonic aircraft are expensive to build and maintain, and ticket prices are likely to be higher than those for subsonic flights. However, Boom Supersonic believes that the demand for faster travel will justify the costs. The company is also exploring partnerships with airlines and other stakeholders to make supersonic travel more accessible.
Despite these challenges, the opportunities in supersonic aviation are immense. Faster travel times could transform the way we think about long-distance travel, making it more convenient and efficient. The success of the XB-1 has already sparked renewed interest in supersonic technology, and other companies are likely to follow suit. This competition could drive further innovation and bring us closer to a future where supersonic travel is the norm.
Conclusion
The successful test flight of Boom Supersonic’s XB-1 marks a historic achievement in aviation, demonstrating the potential for a new era of supersonic passenger travel. By breaking the sound barrier, the XB-1 has shown that private companies can lead the way in developing advanced aviation technologies. This milestone brings us closer to the realization of the Overture, a supersonic airliner that could revolutionize long-distance travel.
As we look to the future, the challenges of regulatory approval, cost, and environmental impact remain. However, the opportunities for innovation and progress are immense. The success of the XB-1 is a testament to the power of human ingenuity and the potential for technology to transform our world. With continued investment and collaboration, supersonic travel could become a reality for everyone, making the world smaller and more connected than ever before.
FAQ
What is the significance of the XB-1’s supersonic flight?
The XB-1’s supersonic flight is significant because it is the first time a civil aircraft has broken the sound barrier in U.S. history. This achievement demonstrates the potential for private companies to develop supersonic passenger aircraft.
What is the Overture?
The Overture is Boom Supersonic’s next-generation supersonic airliner, designed to carry 64 passengers. It is expected to start regular commercial operations in the 2030s, offering faster travel times and a more sustainable approach to supersonic flight.
What are the challenges facing supersonic travel?
Challenges include regulatory approval, high development and operational costs, and environmental concerns such as noise and emissions. Boom Supersonic is working to address these issues through advanced technology and sustainable practices.
Sources: Live Science
Sustainable Aviation
DSV and Google Cloud Start SAF Pilot to Cut Air Freight Emissions
DSV will secure up to 9.7 million liters of SAF for Google Cloud’s air freight, targeting 25,000 tonnes of lifecycle emissions cuts.

DSV will secure up to 9.7 million liters (2.5 million US gallons) of sustainable aviation fuel (SAF) for Google Cloud’s air freight in a pilot agreement that the logistics company expects to reduce lifecycle greenhouse gas emissions by 25,000 tonnes compared with conventional jet fuel.
DSV announced the collaboration in a press release dated November 11, 2026. The fuel will cover Google Cloud’s air freight on a key lane of its shipments, and the companies describe the agreement as a pilot that prepares the ground for a broader sustainability collaboration. It is a smaller deal than the SAF agreement DSV announced in April 2026 with Microsoft, United Airlines and Phillips 66, but it runs on the same book-and-claim model and the same certification and registry chain.
How the book-and-claim pilot works
Under the book-and-claim methodology used in the pilot, emissions reductions can be allocated to Google Cloud regardless of where the fuel is physically used. DSV said the SAF is made only from waste and residue feedstocks, excluding palm and palm-derived materials, and cuts lifecycle aviation emissions by 85% compared with conventional fossil jet fuel.
The fuel is third-party certified under the International Sustainability and Carbon Certification (ISCC) scheme. Its environmental attributes are issued, transferred and retired through the independent Sustainable Aviation Fuel Certificate Registry (SAFc Registry), with support from DSV’s internal tracking. According to the release, each tonne of CO₂e reduction is assigned to a specific shipper and protected against double-counting, giving Google Cloud an auditable trail for its emissions reporting.
DSV’s own book-and-claim service page sets out the commercial terms behind such deals. Customers pay a premium that reflects the price gap between low-carbon and conventional energy, based on the volume bought rather than individual shipments, and the system is audited annually by an independent third party. DSV says most companies report the reductions under Scope 3 Category 4 or 9, and that the Science Based Targets initiative (SBTi) Corporate Net-Zero Standard Version 2.0, published in June 2026, explicitly recognises activity-pool-based book-and-claim approaches for transport.
What the two companies said
Frank Sobotka, CEO of DSV’s Air & Sea Division, said: “Our customers want practical ways to lower the emissions of the goods they move.” He said combining Google Cloud’s ambition with DSV’s SAF programme is how “we turn a sustainability goal into measurable results in air freight.”
Brian Stewart, Senior Director, Logistics, at Google Cloud, said the collaboration builds on the company’s efforts to cut emissions across its global logistics operations. “Partnering on sustainable aviation fuel provides an auditable, transparent mechanism to address air freight emissions,” he said.
DSV’s April deal with Microsoft, United and Phillips 66
The Google Cloud pilot follows a larger arrangement DSV announced on April 15, 2026. In that deal, Phillips 66 can supply up to 11 million gallons (41.6 million litres) of SAF, expected to cut lifecycle greenhouse gas emissions by about 100,000 tonnes compared with conventional jet fuel. United Airlines uses the fuel, while DSV and Microsoft take part through book and claim. DSV said those savings are roughly the equivalent of one freighter flight per day, every day of the year.
Lauren Riley, Chief Sustainability Officer at United Airlines, called it “the largest contracted SAF supply agreement with a single customer, DSV,” in the history of United’s Eco-Skies Alliance corporate SAF program. The April transaction used the same ISCC certification and SAFc Registry tracking described in the Google Cloud release.
For scale, DSV’s United States fact sheet lists, for 2025, more than 150,000 employees, a network in more than 90 countries and more than 2 million tons of airfreight. The group acquired Schenker, and Frank Sobotka, who heads its Air & Sea Division, is quoted in both the Google Cloud and the April releases.
Where SAF supply stands
DSV’s release says SAF supply is limited, so customer and partner commitments are needed to build the demand that allows wider use. The International Air Transport Association (IATA) estimated on June 6, 2026, that global SAF output would reach about 2.4 million tonnes in 2026, or 0.8% of aviation fuel use, at a cost to airlines of $4.3 billion. IATA Director General Willie Walsh called 2026 another disappointing year for SAF.
IATA’s own list of priorities includes a global SAF market with enough volume at viable prices, supported by a book-and-claim system and harmonized standards. That is the mechanism DSV uses with shippers such as Google Cloud and Microsoft: the reduction is allocated to the customer regardless of where the fuel is physically used.
Other air cargo SAF programs covered by AirPro News include DHL Express’s TotalEnergies fuel deal at Paris CDG and SHEIN’s SAF pilot with DHL Express. DSV has not disclosed which lane the Google Cloud fuel will cover, the airline involved or the pilot’s duration.
Sustainable Aviation
DHL Express Starts SAF Flights at Paris CDG With TotalEnergies Fuel
DHL Express signed a SAF deal with TotalEnergies covering 5 million liters in its first year for flights from Paris Charles de Gaulle.

DHL Express has signed a sustainable aviation fuel (SAF) supply agreement with TotalEnergies whose initial phase covers 5 million liters over one year, for aircraft departing its hub at Paris Charles de Gaulle Airport (CDG). It is DHL Express’s first SAF use in France. The first SAF-powered DHL aircraft left CDG on November 9, 2026, the day the deal was announced.
In a press release dated November 9, 2026, issued from Bonn and Paris, DHL said it is the first express logistics provider to use SAF at CDG. The move coincides with the fifth anniversary of the Paris hub. DHL expects emission reductions of about 11,800 metric tons of CO2e a year in France, with the SAF flights running from CDG to its air hubs in Leipzig, Casablanca, Milan and London.
What the Paris agreement covers
DHL describes the deal as a first SAF supply agreement “over 5 million liters” for DHL Express air operations, and said its initial phase covers 5 million liters over the course of one year for aircraft departing the Paris CDG hub. DHL said the SAF is made from waste and residual materials such as used cooking oil, and works in existing aircraft and airport infrastructure without modifications. Compared with fossil jet fuel, it can cut lifecycle greenhouse gas emissions by about 80%, depending on feedstock and production method.
The volumes will also be included in GoGreen Plus, DHL’s book-and-claim offering, which assigns emission reductions to customers even when their shipments do not physically travel on SAF. DHL said customers can use it to reduce their Scope 3 emissions. SHEIN signed a GoGreen Plus agreement with DHL Express in March 2026 to use SAF supplied by DHL for its international express air freight.
Travis Cobb, executive vice president of global network operations and aviation at DHL Express, pointed to the share of SAF already used in DHL’s own fleet:
“In 2025, SAF already accounted for 10% of the aviation fuel used across DHL’s own aircraft fleet”
Philippe Prétat, CEO of DHL Express France, said the opening of the Paris hub in 2021 marked a major milestone, and that SAF use shows that strong logistics performance and a lower carbon footprint can go together. Mathieu Soulas, director of new mobilities at TotalEnergies, said “Sustainable Aviation Fuels are a key lever for reducing aviation emissions today.”
How the deal compares with DHL’s SAF targets
At 5 million liters, the Paris deal is small next to the supply agreements DHL Express has signed elsewhere. In March 2022, DHL announced deals with bp and Neste for more than 800 million liters of SAF until 2026, which it described at the time as among the largest SAF deals in aviation. In May 2026, DHL Express signed an offtake agreement with SAF One for 25,000 metric tons of unblended SAF a year from a plant in Bahrain, with production planned for 2028.
DHL’s stated aim is to raise SAF use to 30 percent by 2030, a goal it restated in May 2026 and that also appears in the Sustainability Roadmap it cited in March 2022. DHL said in March 2026 that SAF accounted for about 10% of fuel consumption in its dedicated air fleet in 2025, up from 3.5% in 2024.
TotalEnergies has been expanding its SAF output in France. In a June 16, 2025 release, the company said it expects to produce more than half a million tons of SAF a year from 2028, to cover the increase in the European SAF blending mandate, set at 6% for 2030. It said its Grandpuits biorefinery would have capacity for 230,000 tons a year of SAF in 2026, and that SAF coprocessing had begun at its Normandy platform. The company said it supplies SAF-blended jet fuel to airports including Paris-Le Bourget, Bordeaux and Toulouse, and that Air France-KLM had signed a deal for up to 1.5 million tons of SAF over ten years.
The Paris CDG hub at five years
DHL opened the CDG hub in 2021 with a EUR170 million investment, which it describes as its largest in France since entering the country in 1976. The site occupies a 91,000-square-meter plot with 34,000 square meters of operational space, and its sorting system handles up to 38,000 parcels and documents per hour. The hub runs 24/7 and employs 760 people.
The AirPro Atlas lists 72,029,407 passengers at CDG in 2025.
DHL also cited ground-side measures in France. It said all of DHL Express France’s owned light commercial vehicles are electric, that it serves 55 French city centers with low-emission delivery modes, and that this supports DHL Group’s target of two-thirds last-mile electrification by 2030.
Sustainable Aviation
Singapore Airlines Signs SAF Offtake Deal with Aether Fuels
Singapore Airlines commits to buying SAF from Aether Fuels’ Project Beacon facility in Singapore, due online in 2028.

Singapore Airlines (SQ) has finalized a firm purchase agreement to offtake next-generation Sustainable Aviation Fuel (SAF) from Aether Fuels, becoming the first carrier to commit to the upcoming Project Beacon production facility in Singapore.
Announced in a joint press release on 28 October 2026, the agreement transitions a previous memorandum of understanding into a binding contract. The deal secures future fuel volumes to support the airline’s target of replacing 5 percent of its total fuel consumption with SAF by 2030.
Transitioning from framework to firm commitment
The 28 October 2026 announcement builds on a Memorandum of Understanding (MoU) signed by the two companies on 4 February 2025. That initial framework outlined the airline’s intention to procure neat SAF for a five-year period, with an option to extend for an additional five years, once Aether commenced commercial production.
While the companies confirmed the transition to a firm offtake agreement, the exact fuel volumes and financial terms were not disclosed in the release.
Project Beacon and the Aurora technology
Aether Fuels, a climate technology firm incubated and funded in 2022 by Temasek-backed deep tech venture firm Xora, officially launched Project Beacon on 11 November 2025. The project is a partnership with Aster, a joint venture between Indonesian chemical and infrastructure company Chandra Asri and commodities trader Glencore.
The commercial-scale SAF facility will be located at Aster’s refining hub on Pulau Bukom in Asia-Pacific in Singapore. Aster acquired this site from Shell to develop a dedicated sustainable fuels footprint. Construction of the facility is scheduled to commence in 2026.
Once operational in 2028, Project Beacon is projected to produce 50 barrels per day, equating to approximately 2,000 tons of SAF annually. The plant will utilize Aether’s proprietary Aurora technology to produce Fischer-Tropsch Synthesized Paraffinic Kerosene (FT-SPK). According to Aether Fuels, this pathway is expected to deliver a minimum 70 percent reduction in greenhouse gas emissions compared to conventional jet fuel.
De-risking commercial scale-up
The firm offtake agreement follows a critical technical milestone for Aether Fuels. On 29 September 2026, the company announced the successful operation of a fully integrated demonstration line at RTI International in North America.
The 2.5 barrel-per-day system combined Aether’s Aurora Tri-Converter and Upgrader units with an existing Fischer-Tropsch reactor. The demonstration successfully converted renewable natural gas derived from landfill gas and captured industrial carbon dioxide into synthetic aviation fuel meeting ASTM D7566 specifications. This successful run provided the engineering data required to de-risk the design and scale-up of the Project Beacon facility ahead of its construction phase.
Singapore’s SAF ecosystem and airline targets
The aviation industry is increasingly reliant on SAF to meet decarbonization targets, but feedstock availability remains a primary bottleneck. Aether’s FT-SPK pathway addresses this by utilizing industrial waste gases and biomethane, bypassing the constrained agricultural and lipid-based feedstocks, such as used cooking oil, that dominate current SAF production.
The agreement aligns with broader regional regulatory shifts. The Civil Aviation Authority of Singapore (CAAS) has mandated a SAF levy for flights departing Singapore starting in 2026 to fund centralized SAF procurement. Singapore Airlines, which operates a fleet with an average age of under eight years, has committed to achieving net-zero carbon emissions by 2050.
AirPro News analysis
We view this firm offtake agreement as a clear indicator of the tightening future market for non-lipid SAF. The aviation sector’s reliance on Hydroprocessed Esters and Fatty Acids (HEFA) SAF is running into hard limits regarding used cooking oil and tallow availability. By committing to Aether’s FT-SPK product before the Project Beacon facility has even broken ground, Singapore Airlines is moving aggressively to lock in alternative feedstock pathways.
This early commitment is necessary for airlines aiming to meet 2030 mandates. The lead times for financing, constructing, and scaling novel waste-to-fuel facilities span several years, meaning airlines cannot wait for commercial production to begin before securing their supply lines.
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