Understanding Sustainable Aviation Fuels and Their Role in Fleet Fuel Management

The global aviation industry is under sustained pressure to lower its carbon footprint while continuing to support economic growth and global connectivity. Commercial aviation currently accounts for roughly 2-3% of global CO2 emissions, and with air travel demand projected to double by 2040, finding viable alternatives to conventional jet fuel has become an operational and strategic priority. Among the most promising solutions are biofuels, more accurately termed Sustainable Aviation Fuels (SAFs). These fuels, derived from biological feedstocks rather than crude oil, offer the potential to reduce lifecycle greenhouse gas emissions by up to 80% compared to traditional Jet A or Jet A-1 fuel. For fleet operators and fuel managers, integrating SAF into existing fuel management systems represents both a technical challenge and a significant opportunity to meet sustainability targets without compromising performance or safety.

Sustainable Aviation Fuels are not a single product but a family of fuel types produced through different pathways and from various feedstocks. The most commercially mature pathway is Hydroprocessed Esters and Fatty Acids (HEFA), which uses oils and fats from sources such as used cooking oil, animal fats, and oilseed crops. Other emerging pathways include Alcohol-to-Jet (ATJ), which converts ethanol or isobutanol into jet fuel; Fischer-Tropsch (FT) synthesis, which gasifies biomass or municipal solid waste into syngas and then converts it into liquid fuel; and Power-to-Liquid (PtL), which uses renewable electricity to produce hydrogen and combine it with captured CO2 to create synthetic kerosene. Each pathway produces a fuel that must meet the same rigorous specifications as conventional jet fuel, ensuring complete safety and performance compatibility. This is achieved through ASTM International standard D7566, which certifies synthetic hydrocarbons for use in commercial aviation. Once certified, SAF is typically blended with conventional jet fuel at concentrations up to 50%, creating a drop-in fuel that requires no modifications to aircraft engines, fuel storage tanks, or delivery infrastructure. This drop-in capability is a foundational advantage that allows fleet operators to begin using SAF immediately, without waiting for new aircraft or specialized equipment.

The Current State of Biofuel Integration in Commercial Aviation Fuel Management

Despite significant progress, SAF currently represents less than 0.5% of global jet fuel consumption. In 2023, approximately 600 million liters of SAF were produced globally, compared to over 350 billion liters of conventional jet fuel. While the percentage is small, the growth trajectory is steep. Production volumes have more than doubled year over year since 2021, driven by policy mandates, corporate sustainability commitments, and increasing capital investment in production facilities. Major airlines including United Airlines, Delta Air Lines, British Airways, and Lufthansa have signed offtake agreements for millions of gallons of SAF, and many have already operated commercial flights with blends ranging from 10% to 50% SAF. For fleet fuel managers, the current challenge is less about technical viability and more about supply availability, price premiums, and logistical coordination.

Production Capacity and Scaling Efforts

Global SAF production capacity is expected to reach approximately 5 billion liters per year by 2025, with dozens of new refineries under construction or in advanced planning stages. Key production regions include North America, Europe, and parts of Asia-Pacific. The United States Department of Energy has set a target of 35 billion gallons of SAF per year by 2050, while the European Union's ReFuelEU Aviation mandate requires that all jet fuel supplied at EU airports contain at least 2% SAF by 2025, rising to 70% by 2050. These policy drivers are creating the demand certainty needed to attract large-scale investment. However, scaling production from current levels to meet these targets will require significant capital expenditure, feedstock supply chain development, and continued innovation in conversion technologies. Fuel managers must stay informed about new production announcements and supply availability to plan their procurement strategies effectively.

Blending Logistics and Infrastructure Considerations

One of the key operational advantages of SAF is that it can be blended with conventional Jet A-1 at the refinery, at a fuel terminal, or at the airport storage facility. Blending does not require dedicated pipelines, tanks, or hydrant systems, though some operators choose to maintain segregated storage for higher blends or for book-and-claim accounting purposes. The fuel is transported using the same supply chain infrastructure, including pipelines, tanker trucks, and into-plane fueling vehicles. For fleet fuel managers, the primary logistical consideration is ensuring a consistent and reliable supply of SAF at the airports where it will be used. This often involves negotiating long-term contracts with fuel suppliers and coordinating with airlines, ground handlers, and airport authorities to ensure that the fuel is available when and where it is needed. The International Air Transport Association (IATA) and the Air Transport Action Group (ATAG) provide guidance on SAF logistics and best practices for integrating SAF into existing fuel management systems. Fuel managers should also be aware of the ASTM D4054 approval process for new SAF pathways, as new fuels entering the market will need to be verified for compatibility with existing fleet operations.

Real-World Operational Examples and Lessons Learned

Several airlines have already demonstrated the practical feasibility of SAF in daily operations. United Airlines operated the first commercial flight using 100% SAF in one engine in 2021, while KLM, Air France, and British Airways have all flown regular flights using SAF blends since 2019. In 2023, the Australian government and Qantas partnered on a major SAF project, and Virgin Atlantic completed a transatlantic flight using 100% SAF. These operations have provided valuable data on fuel consumption, engine performance, and emissions reductions. For fleet fuel managers, the key takeaways are that SAF performs identically to conventional jet fuel in terms of energy density, combustion characteristics, and cold-flow properties. No aircraft modifications are needed for blends up to 50%, and maintenance procedures remain unchanged. The primary barrier remains cost, with SAF currently priced two to four times higher than conventional jet fuel, though this premium is expected to decrease as production scales and technology matures.

Advantages of Biofuels in Aviation Fuel Management

The integration of biofuels into commercial aviation fuel management offers a range of benefits that extend beyond emissions reduction. While environmental considerations are a primary driver, operational and strategic advantages also play an important role in motivating adoption.

Emissions Reduction and Environmental Impact

The most widely recognized advantage of SAF is its potential to reduce lifecycle greenhouse gas emissions. Depending on the feedstock and production pathway, SAF can achieve a 50-80% reduction in CO2 emissions compared to fossil-based jet fuel. This includes emissions from feedstock cultivation, harvesting, transport, and processing, as well as the combustion of the fuel itself. In addition to CO2, SAF combustion produces fewer particulate matter (PM) emissions, which can reduce contrail formation and the associated radiative forcing effects. Sulfur content in SAF is also very low, reducing sulfur oxide (SOx) emissions and the formation of secondary organic aerosols. For fleet operators with aggressive net-zero targets, SAF is currently the only scalable solution for decarbonizing long-haul flights, where battery-electric or hydrogen propulsion technologies are unlikely to be viable for decades.

Energy Security and Supply Chain Resilience

Biofuels can be produced from a wide variety of feedstocks that are geographically distributed, reducing dependence on crude oil imports and volatile global oil markets. This diversification enhances energy security and provides a hedge against supply disruptions caused by geopolitical events, natural disasters, or refinery outages. For countries and airlines looking to reduce their exposure to oil price volatility, local SAF production offers a more stable and predictable supply chain. Many governments are actively supporting domestic SAF production as part of their energy independence strategies, further strengthening the business case for fleet operators to invest in biofuel procurement and infrastructure.

Economic and Market Development Opportunities

The SAF industry is creating new markets and job opportunities across the value chain, including feedstock production, logistics, refining, and distribution. For fleet fuel managers, this means a more competitive supply landscape over time, as multiple producers and pathways come online. The development of a robust SAF market also supports the broader bioeconomy, creating demand for agricultural residues, forestry waste, municipal solid waste, and used oils that might otherwise be landfilled or incinerated. Airlines that were early adopters of SAF have gained positive media attention, strengthened their corporate sustainability credentials, and attracted environmentally conscious corporate customers and passengers. These reputational and commercial benefits can provide a competitive advantage in an increasingly carbon-aware marketplace.

Challenges Facing Biofuel Adoption in Fleet Operations

Despite the clear advantages, widespread adoption of SAF faces several significant barriers that fleet operators and fuel managers must navigate. These challenges are interrelated and require coordinated action across the industry.

Cost Competitiveness and Production Economics

The single biggest barrier to SAF adoption is cost. Sustainable Aviation Fuels currently cost between $2.50 and $6.00 per liter, compared to conventional Jet A-1 at approximately $0.50 to $1.00 per liter. This price premium is driven by higher feedstock costs, the capital intensity of new production facilities, and the relatively small scale of current production. While costs are expected to decline as production scales and technology improves, the pace of cost reduction is uncertain. Fleet operators must decide how to allocate their fuel budgets between conventional fuel and higher-priced SAF, often without the ability to pass the full cost through to passengers. Policy incentives such as the U.S. Inflation Reduction Act's Blended Tax Credit and the EU's Emissions Trading System (ETS) are helping to bridge the price gap, but for many airlines, the economics remain challenging.

Feedstock Availability and Sustainability Concerns

The availability of sustainable feedstocks is, along with cost, a primary constraint on SAF production. Current HEFA production relies heavily on used cooking oil and animal fats, but these feedstocks are limited in volume. Expanding production will require developing new feedstock streams, such as agricultural residues (straw, corn stover, forestry waste), dedicated energy crops (camelina, pennycress, algae), and municipal solid waste. However, each feedstock has its own sustainability considerations, including land use change, water consumption, and potential competition with food production. The Roundtable on Sustainable Biomaterials (RSB) and the International Sustainability and Carbon Certification (ISCC) systems provide frameworks for ensuring that SAF feedstocks are sourced responsibly. Fleet operators must work with fuel suppliers that can provide certified sustainable feedstocks and transparent lifecycle emissions data to meet their own sustainability commitments and regulatory requirements.

Technical Compatibility and Infrastructure Requirements

While SAF is a drop-in fuel for blends up to 50%, higher blends or 100% SAF may require additional testing and certification. ASTM D7566 currently allows blends up to 50% SAF for most pathways, although a 100% SAF standard (ASTM D1655 Appendix) is being developed. For fleet operators using higher blends, compatibility with seals, gaskets, and fuel system components must be verified. Additionally, the long-term storage stability of SAF, particularly for fuels produced from certain feedstocks, is an area of ongoing research. Fuel managers should also consider the training needs of ground handling and maintenance staff to ensure proper handling and documentation of SAF deliveries. While the physical infrastructure for SAF is largely the same as for conventional fuel, the administrative procedures for tracking, reporting, and verifying SAF usage are new and require investment in digital fuel management systems.

Policy and Regulatory Hurdles

The regulatory landscape for SAF is still evolving, with different rules and incentives in different regions. The EU's ReFuelEU Aviation mandate, the UK's SAF Mandate, and the U.S. Sustainable Aviation Fuel Grand Challenge all set targets and provide support, but the rules for compliance, book-and-claim accounting, and emissions reporting vary. Fleet operators with global networks must navigate a patchwork of regulations and may need to manage separate fuel procurement and reporting systems for different regions. The lack of a global emissions accounting framework for SAF can create complications for airlines trying to claim emissions reductions under CORSIA (Carbon Offsetting and Reduction Scheme for International Aviation). Fuel managers need to stay current on regulatory developments and work with legal and sustainability teams to ensure compliance.

Technological and Policy Developments Driving Change

The pace of innovation in SAF production and policy support is accelerating, creating new opportunities for fleet operators to integrate biofuels into their fuel management strategies.

Advances in Fuel Production Technology

New production pathways are moving from laboratory to commercial scale. Alcohol-to-Jet (ATJ) technology, which converts ethanol from corn or cellulosic sources into jet fuel, is being commercialized by companies such as LanzaJet and Gevo. Fischer-Tropsch (FT) gasification of biomass and municipal solid waste is being developed by Fulcrum BioEnergy, Velocys, and others. Power-to-Liquid (PtL) or e-fuels, produced using renewable electricity and captured CO2, represent a longer-term but potentially very high-volume pathway. Each technology has its own cost structure, feedstock requirements, and geographic suitability. For fleet fuel managers, the increasing diversity of pathways means a more resilient and geographically distributed supply base, reducing the risk of feedstock or technology-specific disruptions. The U.S. Department of Energy's Bioenergy Technologies Office and the European Commission's Clean Sky initiative are funding significant research and development to further improve conversion efficiency and reduce costs.

Global Policy Frameworks and Incentives

Policy support is critical to bridging the cost gap between SAF and conventional fuel. The U.S. Inflation Reduction Act includes a Blended Tax Credit for SAF that can provide up to $1.75 per gallon, significantly improving the economics for early adopters. The EU's ReFuelEU Aviation mandate requires increasing SAF blending percentages at EU airports, creating a guaranteed market. The UK's SAF Mandate similarly requires 10% SAF by 2030. CORSIA, ICAO's global carbon offsetting scheme for international aviation, increasingly recognizes the use of SAF as a way to reduce an airline's offsetting obligations. Many national governments are also providing grants and loan guarantees for SAF production facility construction. These policies are reducing the financial risk for fuel producers and making SAF more accessible to fleet operators. Fuel managers should actively monitor policy developments and engage with trade associations such as IATA and the Airlines for America (A4A) to understand how incentives and mandates affect their fuel procurement strategies.

Certification, Quality Standards, and Digital Tracking

The ASTM D7566 standard has been the foundation for SAF certification, ensuring that new fuels meet the same rigorous safety and performance criteria as conventional Jet A-1. As new pathways are approved, the certification process provides confidence to fleet operators and regulators. In addition to fuel certification, the industry is developing digital tracking systems to ensure that SAF usage is accurately recorded and reported. The book-and-claim system, similar to renewable energy certificates, allows airlines to purchase SAF environmental attributes even if the physical fuel is delivered to a different airport. This system enables airlines to support SAF production even when logistics or storage limitations prevent direct delivery to all airports in their network. Platforms such as the Roundtable on Sustainable Biomaterials (RSB) Book-and-Claim system and the International Sustainability and Carbon Certification (ISCC) PLUS system are being used to track and verify SAF sustainability claims. Fleet fuel managers need to understand these systems to ensure that their SAF purchases are properly certified and can be used to meet regulatory and voluntary decarbonization targets.

The Future Outlook for Biofuels in Commercial Aviation

The trajectory for SAF adoption is clearly upward, driven by a combination of policy mandates, corporate sustainability commitments, technological innovation, and increasing public awareness of aviation emissions. While the transition will not be linear or instantaneous, the direction is unmistakable.

Scaling Production to Meet Demand

Industry analysts project that global SAF production could reach 10-20 billion liters per year by 2030, representing approximately 5-10% of total jet fuel demand. To achieve this, significant investment in new production facilities, feedstock supply chains, and logistics infrastructure will be required. Major oil companies such as Neste, Shell, BP, and TotalEnergies are investing heavily in SAF production, along with dedicated biofuel companies like World Energy, LanzaJet, and Gevo. Fleet operators should expect SAF availability to increase steadily, particularly at major hub airports in regions with supportive policies. Fuel managers should establish long-term relationships with multiple suppliers to ensure access to SAF as production grows, and should consider contracts with flexible volume and pricing structures to manage the transition from pilot programs to ongoing operations.

Integration with Fleet Fuel Management Systems

As SAF becomes a larger share of the fuel mix, fleet operators will need to integrate its procurement, blending, and tracking into their standard fuel management systems. This includes updating fuel procurement contracts, adapting fuel inventory management software to account for SAF blends, and developing procedures for verifying SAF sustainability claims. Some airlines are already using digital platforms to track SAF usage across their networks, enabling real-time reporting of emissions reductions and regulatory compliance. The integration of SAF into existing fuel management systems is a natural evolution that will occur as SAF volumes grow and become a routine part of aviation fuel supply. Fuel managers should begin planning for this integration now, even if their current SAF usage is small, to ensure that systems and processes are ready for the scale-up that is coming.

The Path to Net-Zero Aviation

Biofuels and other SAFs are widely recognized as essential to achieving the aviation industry's goal of net-zero carbon emissions by 2050. According to IATA, SAF is expected to contribute approximately 65% of the emissions reductions needed to reach net-zero, with the remainder coming from technology improvements (aircraft and engine efficiency), operational efficiencies, and carbon offsets. This makes SAF the single most important lever for decarbonizing aviation, alongside complementary investments in hydrogen and electric aircraft for short-haul routes. For fleet fuel managers, the shift toward SAF is not a question of if, but when and how fast. Early adopters who invest in understanding SAF procurement, logistics, and verification will be better positioned to meet their sustainability targets, manage costs, and comply with evolving regulations. The future of biofuels in commercial aviation fuel management is one of increasing integration, declining costs, and growing strategic importance. Fleet operators that embrace this transition will be at the forefront of a more sustainable and resilient aviation industry.

The collaboration between airlines, fuel producers, airports, and policymakers will continue to drive progress. Fuel managers who stay informed, build strong supplier relationships, and invest in the necessary digital and operational infrastructure will be well-prepared to navigate the changes ahead. The path to a lower-carbon aviation future runs through sustainable fuel management, and biofuels are a cornerstone of that journey.