This article summarizes reporting by Mainichi and Harumi Kimoto.

Japan has reached a major milestone in the pursuit of hypersonic aviation. In April 2026, a joint research team successfully conducted the nation’s first combustion test of a ramjet engine designed for an experimental Mach 5 passenger aircraft. According to reporting by Mainichi, this technological breakthrough brings the ambitious prospect of two-hour flights between Japan and the United States one step closer to reality.

The collaborative effort, which includes researchers from the Japan Aerospace Exploration Agency (JAXA) and Waseda University in Tokyo, aims to commercialize this ultra-fast travel technology by the 2040s. If successful, the envisioned aircraft would cruise at an altitude of 25 kilometers and reach speeds of roughly 5,400 kilometers per hour. This is approximately six times faster than conventional modern airliners and more than double the top speed of the Concorde, the world’s last supersonic passenger jet, which was retired in 2003.

Beyond point-to-point global aviation, researchers envision the platform serving as a stepping stone for suborbital space tourism. Mainichi reports that by integrating a rocket engine into the airframe, the horizontally launched aircraft could potentially transport passengers to altitudes of 100 kilometers, the internationally recognized boundary of space known as the Kármán line, before returning to land on ordinary airport runways.

Engineering the Mach 5 Ramjet

Simulating Extreme Altitudes and Temperatures

Developing an engine capable of sustained Mach 5 flight requires overcoming immense aerodynamic and thermal hurdles. As detailed by Mainichi, the April combustion test took place at JAXA’s Kakuda Space Center in Miyagi Prefecture, a facility specialized in advanced propulsion systems. Researchers utilized the center to replicate the extreme atmospheric conditions found at an altitude of 25 kilometers, where air pressure drops to just one-hundredth of that at sea level.

The research team tested a 2-meter-long experimental craft, which represents approximately one-fiftieth the length of the envisioned commercial airliner. During hypersonic flight, rapid air compression generates intense shock waves and extreme aerodynamic heating. The recent ground test successfully demonstrated that the ramjet engine could maintain stable combustion in complex airflows while enduring surface temperatures of around 1,000 degrees Celsius, confirming that the heat-resistance performance worked exactly as designed.

The HIMICO Project and Future Milestones

Moving Toward Flight Demonstrations

This engine test is a critical component of the High Mach Integrated Control Experiment (HIMICO), a long-term initiative launched around 2013 by JAXA and Waseda University. Following the successful ground combustion validation, the research team is now setting its sights on real-world atmospheric testing to prove the technology in motion.

Secondary research into the HIMICO project indicates that the next major phase involves mounting a scaled-down experimental vehicle onto a JAXA S-520 sounding rocket. The craft is designed to be deployed mid-flight, accelerating during free fall, and eventually igniting its ramjet engine at Mach 5 to test integrated control systems in actual flight conditions.

Experts involved in the project remain cautiously optimistic about the timeline, acknowledging the immense engineering challenges ahead. Tetsuya Sato, a professor at Waseda University and a key member of the research team, emphasized the preliminary nature of the recent achievement.

“This result is still only a first step. Our dream is to connect it to a Test-Flights demonstration,” Sato told Mainichi.

Hideyuki Taguchi, a professor at the Tokyo University of Science and a former senior research and development executive at JAXA, noted the extended development cycle required for hypersonic platforms. While conventional aircraft take roughly a decade to develop, Taguchi explained to Mainichi that hypersonic planes require a rigorous two-stage demonstration process, first an experimental craft, followed by a passenger version. He expressed hope that the entire development cycle could be completed in about 20 years, aligning with the target of a 2040s commercial rollout.

Industry Implications

AirPro News analysis: The Global Hypersonic Race

We observe that Japan’s successful ramjet test places the country in a highly competitive global race to commercialize next-generation high-speed travel. While aerospace Startups like Boom Supersonic are currently targeting Mach 1.7 for their upcoming sustainable airliners, the JAXA-Waseda initiative is aiming significantly higher with air-breathing Mach 5 technology. This approach also competes conceptually with suborbital point-to-point rocket travel proposed by private spaceflight companies.

Furthermore, the engineering hurdles for commercial hypersonic flight remain formidable. Designing a passenger jet capable of withstanding repeated exposure to 1,000-degree Celsius thermal cycles while maintaining the rapid turnaround times and stringent safety standards of commercial aviation is a challenge akin to building a reusable spacecraft. Achieving the 2040s commercialization target will likely require sustained government funding, international regulatory cooperation, and significant advancements in sonic boom mitigation to allow for overland flights.

Frequently Asked Questions

What is a ramjet engine?

A ramjet is an air-breathing jet engine that uses the aircraft’s forward motion to compress incoming air without the need for rotary compressors. This design makes it highly efficient at supersonic and hypersonic speeds, though it requires high forward speed to begin operating.

How fast is Mach 5?

Mach 5 is approximately 5,400 kilometers per hour (about 3,350 miles per hour). This is roughly six times the speed of a conventional commercial airliner and is generally considered the threshold for hypersonic flight.

When will this hypersonic aircraft be available for passengers?

The Japanese research team, including JAXA and Waseda University, aims to bring the hypersonic passenger plane into practical commercial use in the 2040s, following a projected 20-year development and testing cycle.

Sources

• Mainichi

This article is based on an official press release from Menzies Aviation.

The aviation industry faces mounting pressure to decarbonize, and while in-flight emissions dominate headlines, ground operations offer immediate opportunities for sustainability. According to a recent press release, Menzies Aviation has officially reached its global target of electrifying 25% of its Ground Support Equipment (GSE) by the end of 2025.

Menzies Aviation, recognized as the world’s largest aviation services company operating at 347 airports across 65 countries, achieved this milestone through a dedicated $200 million investment aimed at modernizing its vehicle fleet. The company reported adding more than 620 electric GSE assets to its operations in 2025 alone, pushing the global proportion of its electric equipment from 22% in 2024 to the 25% target. Currently, 11 Menzies locations operate fleets with more than 70% electric GSE, and over 20 locations have surpassed the 50% mark.

Driving the Transition: Fleet Modernization and Regional Success

European Operations Lead the Charge

The transition to electric GSE is heavily dependent on local airport charging infrastructure, leading to regional variations in adoption. In its press release, Menzies Aviation highlighted Europe as the leading region, with more than 50% of all GSE across the continent now fully electric.

Specific European locations have achieved even higher electrification rates. At Milan Malpensa Airport (MXP) in Italy, a partnership with AGS Handling has resulted in over 80% of motorized GSE becoming electric. When combined with a permanent switch to electric Pre-Conditioned Air Units, this allows for fully electric aircraft turnarounds. Additionally, the company noted that Manchester Airport in the UK increased its electric GSE to 40% following the deployment of two hybrid de-icing rigs, while London Gatwick (LGW) and Copenhagen (CPH) introduced fully electric fuel hydrant dispensers to support quieter, lower-emission operations.

Progress in Oceania and South East Asia

Progress is also visible outside of Europe. Menzies Aviation reported that its operations in Oceania and South East Asia increased to 30% electric GSE in 2025. As part of this regional push, the company has initiated trials for electric ground power units (GPUs) in Cairns, Australia.

Bridging the Gap with Alternative Fuels

Recognizing that full electrification is not yet viable at all airports due to infrastructure constraints, Menzies Aviation has expanded its use of lower-emission alternative fuels. The company’s press release details a significant pivot toward Hydrotreated Vegetable Oil (HVO) where electric charging grids remain insufficient.

In 2025, Menzies utilized two million liters of HVO, marking a 50% year-on-year increase from 2024. According to the company, HVO has fully replaced diesel in several major locations, including San Diego, Los Angeles, Amsterdam, and Stockholm Arlanda. The use of this alternative fuel has also been expanded at London Heathrow (LHR) and London Gatwick (LGW).

Corporate Strategy and Financial Alignment

The 25% electric GSE milestone is a component of Menzies Aviation’s broader “All In” sustainability strategy, which targets net-zero greenhouse gas emissions by 2045. The company noted it is the first major aviation services provider to have its net-zero targets validated by the Science Based Targets initiative (SBTi), adding scientific credibility to its corporate goals.

“2025 was a year of real progress towards our net-zero target. Achieving our ambitious goal of 25% electric GSE by 2025 across our fleet and accelerating our adoption of lower‑emissions fuels and renewable energy demonstrates our commitment to reducing emissions, even as our global network continues to grow. We are now focused on building on this momentum, with further increases in electric GSE already underway across our network.”

Crucially, the press release indicates that these sustainability investments are occurring alongside robust financial growth. Menzies reported a 16% year-on-year growth in 2025, surpassing $3 billion in revenue, demonstrating that aggressive decarbonization efforts can run parallel to global expansion.

AirPro News analysis

We observe that while sustainable aviation fuel (SAF) and next-generation electric aircraft frequently dominate media coverage regarding aviation decarbonization, ground operations represent a highly actionable area for immediate, measurable emissions reductions. Transitioning tarmac vehicles from diesel to electric power directly reduces Scope 1 emissions while simultaneously improving local air quality and lowering noise pollution for airport workers and surrounding communities.

However, the data provided by Menzies Aviation underscores a critical industry bottleneck: infrastructure. The speed of GSE electrification is intrinsically linked to the willingness and ability of airports to upgrade their electrical grids and charging capabilities. The reliance on bridge technologies like HVO in major hubs such as Los Angeles and London Heathrow highlights that even well-capitalized service providers must wait for municipal and airport infrastructure to catch up with corporate sustainability ambitions.

Frequently Asked Questions (FAQ)

What is Ground Support Equipment (GSE)?
GSE refers to the vehicles and machinery found on an airport tarmac used to service aircraft between flights. This includes baggage tugs, fuel hydrant dispensers, ground power units, and de-icing rigs.

Why is Menzies Aviation using Hydrotreated Vegetable Oil (HVO)?
While Menzies is transitioning to electric equipment, many airports currently lack the electrical grid infrastructure required to charge large fleets of electric vehicles. HVO serves as a lower-emission “bridge” fuel that can immediately replace diesel in existing combustion engines without requiring new infrastructure.

What is the Science Based Targets initiative (SBTi)?
The SBTi is a corporate climate action organization that enables companies to set greenhouse gas emissions reduction targets grounded in climate science. Menzies Aviation is the first major aviation services provider to have its net-zero targets validated by this body.

Sources: Menzies Aviation Press Release

This article is based on an official press release from Surf Air Mobility.

Surf Air Mobility Inc. (NYSE: SRFM) has officially become a member organization of the Center for Advanced Aviation Technologies (CAAT) Consortium. According to the company’s press release, this development marks a notable industry milestone, as Surf Air Mobility is the first Part 135 passenger operator to join the initiative.

The CAAT Consortium operates as a collaborative national effort spearheaded by the Texas A&M University System in partnership with the Federal Aviation Administration (FAA). Its primary objective is to facilitate the safe and efficient integration of next-generation aviation technologies, such as electric aircraft and autonomous systems, into the National Airspace System.

By joining this consortium, Surf Air Mobility positions itself at the forefront of regulatory and technological advancements in the air mobility sector. We view this integration between active commercial operators and regulatory research bodies as a critical step toward modernizing aviation infrastructure.

Strategic Benefits of CAAT Membership

Unlocking FAA Collaboration and Research

The official announcement outlines several key advantages for Surf Air Mobility as a new consortium member. Primarily, the company gains eligibility to bid on and respond to FAA-funded task orders that are exclusively available to CAAT members. This opens a direct channel for the operator to contribute to federally backed aviation projects.

Furthermore, membership grants Surf Air Mobility enhanced visibility into the FAA’s research priorities and emerging technology requirements. The company will also participate in exclusive working groups and discussions that help shape future solicitations, allowing them to collaborate closely with government, academic, nonprofit, and industry partners.

Industry and Regulatory Perspectives

Leadership Insights on the Integration

Company leadership emphasized the strategic alignment between their operational goals and the consortium’s mission. Deanna White, CEO of Surf Air Mobility, highlighted the importance of this partnership in developing their intelligent operating system for air mobility.

“Membership puts us alongside the organizations defining how next-generation aviation technologies integrate into the national airspace,” stated White in the press release, noting it allows the company to leverage its AI-enabled software capabilities.

The CAAT leadership also welcomed the addition of a commercial operator to their ranks. Albert Bejarano, Acting Associate Director for CAAT, noted that Surf Air Mobility’s inclusion provides a crucial real-world perspective for the consortium’s ongoing research.

“Surf Air Mobility brings a valuable industry perspective through its real-world aviation operations, operational data, and software-enabled capabilities,” Bejarano noted in the release, adding that their participation will bolster technology evaluation efforts.

AirPro News analysis

We observe that Surf Air Mobility’s entry into the CAAT Consortium as the first Part 135 passenger operator is a significant development for the advanced air mobility (AAM) sector. Part 135 operators handle commuter and on-demand operations, meaning they possess practical, day-to-day data on passenger logistics, flight operations, and airspace utilization.

By bridging the gap between theoretical research and active commercial operations, the FAA and Texas A&M can leverage Surf Air’s operational data to create more realistic evaluation pathways for electric and autonomous aircraft. This symbiotic relationship suggests a maturing regulatory approach, where the FAA is actively seeking input from the operators who will ultimately deploy these emerging technologies in the National Airspace System.

Frequently Asked Questions

What is the CAAT Consortium?

The Center for Advanced Aviation Technologies (CAAT) Consortium is a national initiative between the Texas A&M University System and the FAA. It is designed to safely integrate emerging aviation technologies, such as electric and autonomous aircraft, into the National Airspace System.

Why is Surf Air Mobility’s membership significant?

According to the company’s press release, Surf Air Mobility is the first Part 135 passenger operator to join the consortium, bringing real-world operational data and industry perspective to the research initiative.

What benefits does Surf Air Mobility receive from joining?

The company gains access to exclusive FAA-funded task orders, visibility into federal research priorities, and the ability to participate in working groups that will shape future aviation technology solicitations.

Sources

• Surf Air Mobility Press Release