Scenario 4: SAF and battery-electric powered flight in a fragmented world

Techno-economic landscape

Aviation's decarbonization pathway has bifurcated along range capabilities. Battery-electric propulsion has captured the commuter and regional market for flights under 500 kilometers, where energy density requirements remain manageable. These aircraft serve as vital connectors in fragmented European and North American networks, though their range limitations persist as a fundamental constraint.

For medium and long-haul segments, sustainable aviation fuels have emerged as the only scalable decarbonization option. The most significant breakthrough here was overcoming the barriers to ramping up Power-to-Liquid SAF production through coordinated policy support – renewable electricity costs and CO₂ capture efficiency. The integration of declining renewable electricity costs, and carbon pricing mechanisms is progressively closing the cost gap with conventional fuel.

Airport logistics integration – previously an under-researched barrier – has been resolved through coordinated infrastructure investments in SAF distribution and storage systems at major hubs.
 

Geopolitical context

The geopolitical landscape bears scars from the Russian-Ukrainian airspace closures that disrupted global aviation networks in the 2020s. While that specific conflict has stabilized through a détente, the pattern it established – weaponization of airspace – has proliferated. Aviation networks have become permanently fragmented, with multiple closed corridors forcing circuitous routing that increases fuel consumption and operational costs.

Escalating tensions between China and Taiwan have resulted in restricted airspace over the Taiwan Strait, forcing carriers to reroute Asia-Pacific traffic with significant distance penalties. The India-Pakistan corridor remains periodically closed during diplomatic crises, disrupting South Asian connectivity. These fragmented networks have inadvertently created regional aviation zones, where battery-electric aircraft serve contained geographic markets while SAF-powered aircraft navigate the complex web of international restrictions.

The geopolitical crisis environment has accelerated each region's push for energy independence, driving localized SAF production from diverse feedstocks rather than global fuel supply chains.

Economic implications for airlines

Airlines operate under fundamentally transformed cost structures. SAF mandates have increased fuel costs relative to the fossil kerosene baseline, though carbon pricing mechanisms that penalize conventional fuel use have partially offset this increase. Legacy carriers have split their fleets into distinct operational categories: battery-electric aircraft for dense regional networks and SAF-compatible conventional aircraft for longer routes.

Business models have adapted to fragmented networks through aggressive hubbing strategies within politically stable regions. Airlines concentrate traffic through fortress hubs where SAF infrastructure is most developed, creating competitive moats around Amsterdam, Singapore, and Dubai. Route profitability calculations now incorporate geopolitical risk premiums, with carriers demanding higher yields on politically volatile corridors.

The capital-intensive nature of fleet renewal has driven unprecedented consolidation, as smaller carriers lack resources to maintain dual propulsion capabilities. Airlines have formed SAF purchasing consortia to achieve economies of scale, with long-term offtake agreements providing price stability. Operating margins remain compressed as carriers absorb transition costs while competing on fragmented, lower-density routes.

Economic implications for airports

Airport business models have undergone radical transformation around fuel infrastructure. Major hubs have invested significantly in SAF storage, blending, and distribution systems – infrastructure costs initially feared to be would-be barriers were ultimately overcome through public-private partnerships and governmental infrastructure funds. These facilities now generate new revenue streams as airports charge premium fees for SAF handling and certification services.

Regional airports serving battery-electric aircraft have deployed charging infrastructure requiring different capital investments – electrical grid upgrades and high-capacity charging stations – creating a two-tier airport system. Smaller facilities focused on electric operations required lower absolute investment but face utilization challenges given electric aircraft's limited range restricting traffic volumes.

Airport logistics integration, previously under-researched, has become a core competency. Airports now operate as fuel transition managers, coordinating between multiple SAF suppliers and ensuring quality certification. This complexity has created barriers to entry, with secondary airports struggling to justify SAF infrastructure investments given uncertain traffic volumes in fragmented networks. Commercially, airports have shifted from simple landlord models to active energy infrastructure operators.
 

Economic implications for airframe manufacturers

Airframe manufacturers have navigated a turbulent decade dominated by uncertainty over propulsion futures. The absence of viable hydrogen propulsion – once heavily marketed by manufacturers – has validated conservative strategies focused on SAF-compatible conventional designs. Airbus and Boeing have concentrated development budgets on optimizing existing airframe platforms for SAF combustion characteristics, which differ from fossil fuels in aromatic and sulfur content, rather than pursuing radical hydrogen redesigns.

Battery-electric aircraft development has been dominated by startups and regional manufacturers capturing the short-range market. Larger, established manufacturers entered this segment cautiously through acquisitions rather than ground-up development. The fundamental challenge remains specific energy of batteries, which has improved incrementally, preventing electric propulsion from threatening mainline aircraft markets.

Capital allocation strategies reflect hard lessons about stranded investments. The research community's warnings about "risk of stranded investments" in dual SAF-hydrogen systems proved prescient, as manufacturers who hedged on hydrogen propulsion wrote off billions in development costs when hydrogen infrastructure proved economically unviable. Subsequently, product roadmaps targeted SAF-optimized engines and airframes, with evolutionary rather than revolutionary improvements.

Passenger experience

For passengers, the aviation experience varies dramatically by route distance and geopolitical geography. Short-haul travelers within stable regions board quiet, smooth battery-electric aircraft for sub-500 kilometer journeys, thanks to electric motors generating lesser noise than turboprops. These flights depart frequently from regional airports, creating distributed networks within Europe, Northeast USA, and East Asia's connected corridors.

Medium and long-haul passengers see little operational difference - aircraft still burn fuel in turbines – but pay fare premiums reflecting SAF cost pass-through. Airlines market these surcharges as "climate contribution fees," with transparency requirements showing exact SAF blend percentages. Savvy travelers track which carriers use highest SAF blends, creating competitive pressure.

Route options have contracted significantly. Transcontinental journeys once served by direct flights now require connections through geopolitically neutral hubs as airspace restrictions force circuitous routing. Europe-Asia travel routes passengers through Middle Eastern hubs to avoid contested corridors. Overall, flight times have increased 15-30% on affected routes.

Booking platforms now display "geopolitical risk scores" and route stability ratings, fundamentally changing how travelers evaluate options in this fragmented world.

Environmental outcomes

Aviation's emissions trajectory shows significant progress enabled by synthetic fuel pathways. Power-to-Liquid SAF achieving lifecycle CO₂ emission reductions of up to 100% (when produced with renewable electricity) has enabled the escalating e-fuel mandates to deliver substantial decarbonization. In Europe, the ReFuelEU Aviation framework has driven the investment certainty needed for commercial-scale electrolyzer and direct air capture deployment. Meeting the full 70% SAF penetration target, however, requires continued acceleration.

Battery-electric aircraft have eliminated emissions from roughly 8–12% of passenger-kilometers- primarily short regional routes- contributing meaningfully to net-zero goals within their operational envelope. However, their limited range means they cannot address medium and long-haul emissions that constitute the majority of aviation's climate impact.

The sustainability goals established in the 2020s are being met through a pathway with theoretically unlimited feedstock potential. However, the high energy intensity – approximately 15–20 MWh of renewable electricity per metric ton of fuel – makes power availability the key scalability constraint, requiring continued massive expansion of dedicated renewable generation capacity.