Sustainable aviation fuel (SAF) is widely seen as one of the most practical solutions for reducing aviation emissions. It can cut lifecycle carbon emissions by up to 80% and can be used with existing aircraft engines when blended with traditional jet fuel.
However, despite its promise, SAF remains a small part of the global fuel mix, accounting for less than 1% of aviation fuel use today. So why has it not scaled yet? The answer lies in several interconnected industry challenges, ranging from supply limitations to economic and policy barriers.
For a broader overview of how SAF supports decarbonisation, see VHR’s guide to reducing carbon emissions.
Supply Shortages: The Core Limitation
One of the most significant barriers to SAF adoption is limited supply.
SAF is produced from feedstocks such as waste oils, agricultural residues, and other renewable materials. While these sources are innovative, they are not yet available at the scale required to meet global aviation demand.
Airlines operate at vast volumes, and replacing traditional jet fuel requires industrial-scale production. At present, SAF production capacity simply cannot keep up. This creates a bottleneck where demand is growing faster than supply.
In addition, competition for feedstocks from other industries, such as road transport and chemicals, adds further pressure. Scaling SAF sustainably means ensuring feedstock availability without negatively impacting food systems or other supply chains.
Infrastructure Challenges Across the Value Chain
Although SAF can be blended with existing fuels, the broader infrastructure supporting its production and distribution is still developing.
Key infrastructure challenges include:
- Limited refining facilities capable of producing SAF
- Distribution networks that are not yet optimised for large-scale SAF transport
- Airport fuelling systems that require adaptation for consistent supply
While the aviation industry benefits from not needing entirely new aircraft systems, the upstream and midstream infrastructure gaps remain significant. Investment is needed across refineries, storage facilities, and logistics networks to enable consistent and widespread use.
High Production Costs
Cost remains one of the biggest barriers to scaling Sustainable Aviation Fuel. Today, SAF can cost up to four times more than conventional jet fuel.
This price gap is driven by:
- Expensive production processes
- Limited economies of scale
- High costs of sustainable feedstocks
- Early-stage technologies
For airlines already operating on tight margins, absorbing these costs is challenging. Without sufficient financial incentives or regulatory pressure, airlines may struggle to justify widespread adoption of SAF.
Until production scales and technology becomes more efficient, cost competitiveness will remain a major obstacle.
The Role of Government Incentives and Policy
Government action plays a key role in accelerating SAF adoption, yet policy frameworks vary widely between regions.
Support mechanisms such as subsidies, tax credits, and blending mandates can significantly reduce barriers. However, inconsistent policies across countries create uncertainty for investors and aviation companies.
Stronger and more aligned global policy could:
- Encourage long-term investment in SAF production
- Reduce financial risk for producers and airlines
- Accelerate infrastructure development
Without clear and stable policy support, the SAF market may struggle to gain the confidence required for rapid expansion.
Investment Requirements and Market Risk
Scaling Sustainable Aviation Fuel is a capital-intensive process.
Significant investment is required across:
- Research and development
- Production facilities
- Supply chain infrastructure
- Workforce skills
However, investors face uncertainty due to fluctuating fuel prices, evolving technologies, and policy changes.
- Producers hesitate to build facilities without guaranteed demand
- Airlines hesitate to commit without reliable supply and competitive pricing
Breaking this cycle requires coordinated effort between governments, investors, fuel producers, and airlines.
What This Means for Aviation Recruitment and Talent
The transition to sustainable aviation is not just a technological challenge; it is also a talent challenge.
As Sustainable Aviation Fuel production scales, demand is increasing for professionals in:
- Chemical and process engineering
- Renewable energy and fuel technology
- Supply chain and logistics
- Sustainability and ESG strategy
For aerospace and aviation employers, securing skilled talent will be critical to delivering SAF projects and meeting net zero targets.
Specialist recruitment partners such as VHR play an important role in connecting organisations with engineers, project managers, and sustainability experts who can support this transition globally.
Progress Depends on Collaboration
Sustainable aviation fuel offers one of the most immediate pathways to reducing aviation emissions, but scaling it is complex.
Supply shortages, high costs, infrastructure gaps, policy uncertainty, and investment risks are all holding back adoption.
Overcoming these challenges will require collaboration across the entire aviation ecosystem. With the right combination of innovation, funding, and policy support, SAF can move from a niche solution to an industry standard.
