In this episode, we speak with Adam Klauber, Chief Sustainability Officer at World Energy, who has been at the forefront of developing book and claim mechanisms for sustainable aviation fuel since its earliest days.

He discusses:

• The co-claims approach: Why aviation needed to diverge from renewable electricity market models by enabling both airlines (scope 1) and their corporate customers (scope 3) to claim emissions reductions from the same SAF molecules, unlocking new sources of funding.
• What it took to get early deals done: How some of the earliest SAF buyers like Microsoft moved before the supporting infrastructure was fully in place, including clear registries and standardised accounting rules, and why that early willingness mattered.
• Insetting vs offsetting: The moral hazard of buying cheap offsets outside aviation, and how insetting addresses this while maintaining economic efficiency.
• Making SAF contracts “bankable”: How long-term commitments from credible corporate buyers can help producers secure debt capital at lower interest rates, thereby lowering financing costs and easing the SAF price premium over time.
• Building market infrastructure that benefits the whole sector: Why World Energy deliberately builds frameworks that benefit competitors, recognising that growing the overall SAF market serves everyone’s interests and that no single company wins with only a trickle of supply.

If you LOVED this episode, you’ll also love the conversation we had with Gene Gebolys, founder and CEO of World Energy, who delves into the intricacies and future of SAF. Check it out here. 

Learn more about the innovators who are navigating the industry’s challenges to make sustainable aviation a reality, in our new book ‘Sustainability in the Air: Volume 2’. Click here to learn more.

Feel free to reach out via email to [email protected]. For more content on sustainable aviation, visit our website green.simpliflying.com and join the movement. It’s about time.

Links & More:

World Energy

Blueprints for Bankability - RMI 

Re-thinking the blueprint for financing SAF - SimpliFlying

Efficient, effective decarbonization with carbon insets - World Energy  

In this episode, we speak with Rachel Gardner-Poole, GAIN steering group chair and sustainable aviation consultant at NATS, the UK’s leading air traffic control provider. 

Gardner-Poole shares how GAIN (Green Aviation Insights Network) is bringing together air navigation service providers from around the world to optimise flight paths and reduce emissions using tools and insights that can deliver results today. She discusses:

• GAIN’s dual purpose: A global collaboration of air navigation service providers (ANSPs) and a dashboard tool that measures airspace efficiency, enabling ANSPs to identify inefficiencies, benchmark performance by airline and route, and track CO2 emissions in real time.
• Why airspace efficiency matters now: Whilst SAF faces supply constraints and hydrogen aircraft remain years away, airspace optimisation can deliver immediate carbon savings. 
• Breaking down communication barriers: How misaligned assumptions between airlines and air traffic controllers often lead to suboptimal flight paths, and how GAIN’s data visualisation enables targeted conversations to unlock tactical savings.
• The founding members’ impact: With five founding members helping shape the tool, GAIN could save over 450,000 tonnes of CO2 annually.
• Addressing greenwashing concerns: Unlike complex carbon credit schemes or predictive modelling, GAIN uses real, verifiable flight path data.
• Future expansion plans: The goal is to reach 40% of the world’s 160 ANSPs by 2030, with potential features including non-CO2 effects like contrails, and partnerships with organisations across the aviation sector.

If you LOVED this episode, you’ll also love the conversation we had with Sian Andrews, SESAR Environmental Lead at NATS, who shares how air traffic management can reduce aviation’s environmental impact. Check it out here. 

Learn more about the innovators who are navigating the industry’s challenges to make sustainable aviation a reality, in our new book ‘Sustainability in the Air: Volume 2’. Click here to learn more.

Feel free to reach out via email to [email protected]. For more content on sustainable aviation, visit our website green.simpliflying.com and join the movement. It’s about time.

Links & More:

NATS 

Green Aviation Insights (GAIN) - NATS 

NATS and leading ANSPs unite to drive sustainable aviation through a novel data-driven insights tool - CANSO

NATS environmental initiative GAIN-ing momentum - Aviation Week Network  

In this special year-end episode, we explore conversations with industry leaders revealing where sustainable aviation truly stands in 2025.

• Matt Gorman, Director of Carbon Strategy at Heathrow Airport, reveals airports control just 0.1% of their carbon footprint directly but use landing charges to incentivise SAF adoption.
• Tamara Vrooman, CEO of Vancouver Airport, explains moving their net-zero target forward to 2030 by leveraging control of central infrastructure.
• Lena Wennberg, Chief Sustainable Development Officer, and Therese Forsström, Head of Environmental Department at Swedavia, explain achieving fossil-free operations in 2020 and how they are looking to support fossil-free domestic flights in Sweden by 2030.
• Aaron Robinson, Vice President of SAF at International Airlines Group, identifies airlines’ reluctance to adopt SAF as a cultural problem rooted in safety-first mindsets that resist innovation.
• Matthew Ridley, Director of Sustainability at The oneworld Alliance, discusses their $150 million fund with Breakthrough Energy Ventures for next-generation SAF.
• Trevor Best, CEO of Syzygy Plasmonics, details their photocatalytic technology converting biogas into SAF at smaller scales, targeting jet fuel parity.
• Tim Boeltken of INERATEC explains their modular e-fuel technology deployable wherever green hydrogen is produced.
• Marc Allen, CEO of Electra, describes how electric aircraft will succeed by enabling new capabilities like 150-foot takeoffs rather than competing with jet fuel.
• Billy Thalheimer of Regent introduces Seagliders – wing-in-ground effect vehicles offering new transportation for coastal routes.
• Jolanda Stevens, Program Manager for Zero Emission Aviation at KLM, emphasises airlines’ responsibility in enabling hydrogen and electric aircraft.
• Luke Farajallah, CEO of Loganair, discusses how their mandatory £1 carbon levy receives almost no passenger complaints.

If you LOVED this episode, you’ll also love all the conversations we had through the year with dozens of industry executives, technology leaders and scientists. Check out the archive here. 

Learn more about the innovators who are navigating the industry’s challenges to make sustainable aviation a reality, in our new book ‘Sustainability in the Air: Volume 2’. Click here to learn more.

Feel free to reach out via email to [email protected]. For more content on sustainable aviation, visit our website green.simpliflying.com and join the movement. It’s about time.

Links & More:

Book: Sustainability in the Air, Vol Two - SimpliFlying

Sustainable Aviation Outlook Report 2025 - SimpliFlying  

In this episode, we speak with Nanna Baldvinsdottir, co-founder of IðunnH2, about how Iceland’s unique energy system could turn the country into a green fuel bridge between Europe and North America. 

A veteran of Iceland’s power sector, Nanna has spent two decades working in renewables before turning to hydrogen and e-fuels development.

Nanna shares how IðunnH2 is developing a 300 MW, ~70,000 tonne-per-year e-SAF project near Keflavík International Airport, designed first to decarbonise Icelandic aviation and only then supply the wider world via book-and-claim. She explains why social licence for new wind power, local energy security, and predictable permitting make Iceland a testbed for scaling e-fuels where other regions are still stuck on the drawing board.

Nanna discusses:

• Why SAF, not hydrogen export, came out on top in IðunnH2’s feasibility work – and how switching mid-study unlocked a path to true commercial scale rather than niche pilot projects.
• The Helguvík project: locating a commercial-scale e-kerosene facility a stone’s throw from Iceland’s main international airport, using 100% renewable power contracted via long-term PPAs.
• Book-and-claim as a strategic tool: using it to serve committed early partners like Luxaviation and other motivated buyers outside Iceland, while keeping the bulk of production for Icelandic decarbonisation.
• Moving beyond “Jet A price parity”: why chasing price parity with fossil jet fuel misses the point since jet fuel is heavily subsidised and untaxed, and how 15-year price stability can be more valuable to airlines than simply being the cheapest.
• Her role as a “system builder”: why e-fuel plants are far more complex than traditional power projects, and what it takes to keep partners aligned on timelines, risk, margins, and ambition.
• The wider Icelandic hydrogen roadmap: how aviation, maritime, and road transport could all draw on the same hydrogen and e-fuels backbone as the market matures.
  
  

Learn more about the innovators who are navigating the industry’s challenges to make sustainable aviation a reality, in our new book “Sustainability in the Air: Volume 2.” Click here to learn more.

Feel free to reach out via email to [email protected]. For more content on sustainable aviation, visit our website green.simpliflying.com and join the movement. It’s about time.

Links & more:

• IðunnH2
• Why Iceland? - IðunnH2
• SAF – IðunnH2
• Hydrogen and E-fuels Roadmap for Iceland
• Nanna Baldvinsdottir - LinkedIn
• EU ReFuelEU Aviation Mandate

In this episode, we speak with Billy Thalheimer, co-founder and CEO of REGENT, who shares how the company is redefining travel with their all-electric Seagliders. 

Thalheimer discusses:

• Solving the regional travel gap: How seagliders address the transportation problem on 50–200 mile coastal routes, creating a faster, cheaper, and greener alternative for the 40% of the world’s population living in coastal communities.
• Three breakthrough technologies in one vehicle: How REGENT combines wing-in-ground effect aerodynamics, hydrofoil systems (providing five feet of wave tolerance).
• Maritime certification, not aviation: Why seagliders operate as vessels under Coast Guard and IMO jurisdiction rather than FAA oversight, with operators certificated as master mariners rather than pilots—solving the regional pilot shortage whilst creating a six-week training pathway for professional mariners.
• Commercial and defence applications at scale: How REGENT has secured over $10 billion in orders from airlines, ferry operators, and energy companies, with use cases ranging from commuter services to offshore wind farm logistics and military operations.
• Infrastructure advantage and electrification: Why existing docks can accommodate Seagliders with minimal modification, creating “high-speed rail without the billions in rail infrastructure” whilst leveraging emerging port electrification efforts from the cruise and ferry industries.

If you LOVED this episode, you’ll also love the conversation we had with Nathan Millecam, President & CEO of Electric Power Systems (EP Systems), where he talks about designing the ideal battery to power electric aircraft. Check it out here. 

Learn more about the innovators who are navigating the industry’s challenges to make sustainable aviation a reality, in our new book ‘Sustainability in the Air: Volume 2’. Click here to learn more.

Feel free to reach out via email to [email protected]. For more content on sustainable aviation, visit our website green.simpliflying.com and join the movement. It’s about time.

Links & More:

REGENT Craft 

REGENT Craft successfully conducts high-speed test of its electric ‘Seaglider’ - MSN

This ‘flying boat’ could be the future of travel in Scotland - The Independent 

REGENT lands major order for 27 all-electric seagliders to advance coastal mobility - Offshore Energy

In this special compilation episode, recorded live at the Dubai Airshow 2025, five aviation industry leaders share their perspectives on whether the Middle East can balance rapid aviation growth with sustainability goals.

Featuring insights from:

• Paul Griffiths, CEO, Dubai Airports
• Julien Manhès, Head of SAF and CDR, Airbus
• Yousif Bin Saeed Al Lootah, CEO, Lootah Biofuels
• Darren Hulst, Vice President of Commercial Marketing, Boeing
• Michel Azar-Hmouda, President of Commercial Aviation, CAE

Together, they answer one central question: where does the Middle East have the greatest opportunity to lead in sustainable aviation, and what could stand in the way? 

Throughout the episode, the aviation leaders explore the region’s unique advantages, including large scale infrastructure, abundant renewable energy, strategic geography, and strong political commitment, positioning it as a proving ground for next generation sustainable aviation technologies. They also address the challenges that can potentially threaten progress, from workforce development and supply chain alignment to the difficulty of turning ambition into reality.

This is a compilation of highlights from five in-depth conversations. Stay tuned for the full interviews on our Sustainability In The Air platform.

If you LOVED this episode, you’ll also love all the conversations we had through the year with dozens of industry executives, technology leaders and scientists. Check out the archive here. 

Learn more about the innovators who are navigating the industry’s challenges to make sustainable aviation a reality, in our new book ‘Sustainability in the Air: Volume 2’. Click here to learn more.

Feel free to reach out via email to [email protected]. For more content on sustainable aviation, visit our website green.simpliflying.com and join the movement. It’s about time.

Sponsor message: This episode was recorded live in partnership with the Dubai Airshow 2025 and CAE.

For nearly 80 years, CAE has delivered cutting-edge training and simulation solutions across 240 sites in over 40 countries, preparing aviation professionals for critical moments while putting sustainability at the center of what they do.

In this episode, we speak with Julia Fidler, former Director of Market Development for Energy, Connectivity, and Sustainability at Microsoft, who shares how the company built partnerships that are reshaping corporate approaches to scope 3 emissions.

Fidler discusses:

• How Microsoft’s early carbon fee on scope 1, 2, and 3.6 emissions created the foundation for treating business travel not just as a measurable category, but as a gateway to solving fuel emissions.
• How Microsoft’s Sustainability Grant Program supported early exploration of emerging SAF markets through seed funding for consulting guidance and partnerships, creating a model for corporate innovation in hard-to-abate sectors.
• Why Microsoft chose to support the most expensive SAF pathway (e-fuels/power-to-liquids) and how the concept of “green premium” enabled a three-way collaboration between Microsoft, Alaska Airlines, and Twelve.
• How the partnership with IAG and the Chooose removed barriers for hundreds of Microsoft suppliers to purchase SAF for the first time.
• Why Microsoft’s approach balanced carbon removal procurement with SAF investment alongside demand management, treating these not as competing priorities but as complementary strategies.

Fiddler also shares her journey from corporate travel management to leading industry-defining collaborations with airlines and SAF producers, and discusses how she’ll now be scaling these lessons globally through her new role at the RSB.

If you LOVED this episode, you’ll also love the conversation we had with Etosha Cave, Co-founder & Chief Science Officer of Twelve, who shares how the carbon transformation company harnesses CO2 from industrial waste streams to produce e-fuels. Check it out here. 

Learn more about the innovators who are navigating the industry’s challenges to make sustainable aviation a reality, in our new book ‘Sustainability in the Air: Volume 2’. Click here to learn more.

Feel free to reach out via email to [email protected]. For more content on sustainable aviation, visit our website green.simpliflying.com and join the movement. It’s about time.

Links & More:

Microsoft Sustainability 

Alaska Airlines teams with Microsoft to aid development of Twelve’s E-Jet power-to-liquid fuel - GreenAir News 

How Microsoft is using an internal carbon fee to reach its carbon negative goal - Microsoft Industry Blogs  

Microsoft signs sustainable aviation fuel purchase deal with IAG to tackle Scope 3 emissions - ESG Today 

Why Twelve believes power-to-liquids will revolutionise sustainable aviation fuel production - SimpliFlying 

In this episode, we speak with Matthew Ridley, Director of Sustainability and Innovation at the oneworld Alliance, who shares the story behind the groundbreaking $150 million Sustainable Aviation Fuel (SAF) fund launched in partnership with the alliance’s member airlines and Breakthrough Energy Ventures (BEV).

Ridley discusses:

• The alliance investment advantage: How pooling resources across oneworld members creates access to world-class venture capital expertise, superior deal flow, more diverse portfolios, and geographical networks.
• Breakthrough Energy’s unprecedented value: Why partnering with BEV provides access to talent airlines struggle to attract, plus synergies with investments in nuclear fusion, energy transmission, and geologic hydrogen.
• Next-generation focus vs. current needs: How the oneworld BEV fund targets technologies that can take aviation beyond 5-10% SAF adoption to truly change the trajectory of decarbonisation, complementing existing investments.
• Breaking the alliance mould: How oneworld moved beyond traditional codeshares and interlining to tackle “initiatives of scale”, and how they attracted Singapore Airlines to join despite not being a oneworld member.
• Reframing aviation’s challenge: Why the problem isn’t aviation itself, but rather the emissions from jet fuel, the only aspect of flight that hasn’t changed since the Kitty Hawk.

Ridley also shares insights from his seven years building IAG’s Hangar 51, where he led first-mover investments in ZeroAvia and LanzaJet, and explains why SAF isn’t a transition fuel but rather a permanent solution once emissions are addressed.

If you LOVED this episode, you’ll also love the conversation we had with Pasha Saleh, Head of Corporate Development at Alaska Airlines, who shares how the airline is investing in sustainable aviation technologies to achieve its ambitious climate goals. Check it out here. 

Learn more about the innovators who are navigating the industry’s challenges to make sustainable aviation a reality, in our new book ‘Sustainability in the Air: Volume 2’. Click here to learn more.

Feel free to reach out via email to [email protected]. For more content on sustainable aviation, visit our website green.simpliflying.com and join the movement. It’s about time.

Links & More:

Sustainability - oneworld 

oneworld becomes first airline alliance to join IATA CO2 connect - IATA 

oneworld airline partners join with Breakthrough Energy Ventures to invest in new SAF technologies - GreenAir News 

How Alaska Star Ventures is funding the future of sustainable aviation - SimpliFlying 

In this episode, we speak with Dr. Mar Fernández-Méndez, founder of MacroCarbon and professor at the University of Bremen, about her journey from Arctic ice researcher to seaweed entrepreneur. 

Dr. Fernández shares how she's turning pelagic sargassum into sustainable aviation fuel (SAF) while creating a carbon-negative process that enhances marine biodiversity.

Dr. Fernández discusses:

• How Sargassum differs from other algae approaches, avoiding the pitfalls that have plagued microalgae biofuel attempts for decades.
• MacroCarbon's integrated biorefinery that produces multiple revenue streams: bio-stimulants for agriculture, biochar for permanent carbon sequestration, carbon black for tyres and batteries, and ultimately SAF through Fischer-Tropsch synthesis.
• The company's unique approach to hydrogen production, generating its own hydrogen internally rather than requiring external green hydrogen inputs.
• Competitive economics at scale: producing SAF for lower than current market biofuel prices, while being species-agnostic and able to use any brown or green seaweed.
• The roadmap from pilot to first-of-a-kind commercial facility in the Canary Islands, then expansion to Morocco, Azores, Cape Verde, and the Caribbean.
• Balancing academia and entrepreneurship: maintaining her professorship while commercialising proven technology, and the parallels between academic grant-writing and startup fundraising.
• The importance of storytelling in deep tech, moving beyond just having good data to communicating vision effectively for investors.
• The "BlueSaf Plus" vision for 2035: carbon-negative biofuels that enhance marine biodiversity by maintaining floating ecosystems, proving we can have both healthy oceans and sustainable aviation.
  
  

Learn more about the innovators who are navigating the industry's challenges to make sustainable aviation a reality, in our new book 'Sustainability in the Air: Volume 2'. Click here to learn more.

Feel free to reach out via email to [email protected]. For more content on sustainable aviation, visit our website green.simpliflying.com and join the movement. It's about time.

Links & more:

• MacroCarbon
• Dr. Mar Fernández-Méndez - Alfred Wegener Institute
• Dr. Mar Fernández-Méndez - LinkedIn
• Canary Islands Marine Science & Technology Park
• EU ReFuelEU Aviation Mandate

In this episode, we speak with Tamara Vrooman, CEO of Vancouver International Airport (YVR), who shares how the airport has committed to achieving net zero by 2030, and the detailed roadmap they’ve developed to get there.

Vrooman discusses:

• YVR’s accelerated net zero timeline: How they moved from a 2040 target to 2030 by creating a detailed, measurable roadmap with component parts that track progress.
• Four pathways to net zero: Capital build improvements (including Canada’s largest geo-exchange system with over 800 wells), conservation initiatives, sustainable fuels adoption, and comprehensive data monitoring.
• Airports’ role in energy transition: How centrally providing electrification and sustainable energy infrastructure to all airport users creates far greater impact than individual airline or tenant initiatives, positioning airports as critical energy hubs.
• Building British Columbia’s SAF ecosystem: YVR’s partnerships with Air Canada, the provincial government, and regional airports to address the SAF supply chain challenge.
• ACI Level 4+ certification and accountability: Why data-driven accreditation matters for validating progress, enabling peer collaboration, and ensuring return on investment.
• The SAF supply-demand paradox: Airlines are willing to purchase SAF and demand exists, but inconsistent supply remains the critical bottleneck.

Vrooman also shares leadership insights from her past roles, including leading Vancity Credit Union to achieve net zero and serving as British Columbia’s youngest female Deputy Finance Minister, where she helped design North America’s first carbon tax. 

If you LOVED this episode, you’ll also love the conversation we had with Christina Cassotis, CEO of Pittsburgh International Airport (PIT), who shares her vision for transforming the airport into a sustainable aviation hub. Check it out here. 

Learn more about the innovators who are navigating the industry’s challenges to make sustainable aviation a reality, in our new book ‘Sustainability in the Air: Volume 2’. Click here to learn more.

Feel free to reach out via email to [email protected]. For more content on sustainable aviation, visit our website green.simpliflying.com and join the movement. It’s about time.

Links & More:

Vancouver International Airport - YVR

From ground to sky: four sustainability actions at YVR - YVR

How YVR is reimagining the airport experience by blending CX, commercial innovation, and sustainability - FTE  

Why airports should become energy innovation hubs, not just transport hubs - SimpliFlying