American Express launches Amex GBT Sustainable Aviation Fuel (SAF) Index 2026

The release of the Amex GBT SAF Index 2026 is another clear signal that sustainable aviation fuel is moving from ambition to action. What stands out to me is how strongly the report reinforces the role of corporate demand in accelerating this transition. SAF is no longer just an airline initiative. It is becoming a shared responsibility across the aviation value chain, with businesses playing a direct role in scaling adoption.

We are seeing real momentum. SAF production has increased significantly in recent years, following a typical early-stage growth curve, even if it still represents a small fraction of total jet fuel demand today. At the same time, the fundamentals remain clear. SAF can deliver lifecycle emissions reductions of up to 80 percent compared to conventional jet fuel, making it one of the most viable pathways to decarbonise aviation. 

However, the Index also highlights the complexity behind that growth. Supply constraints, feedstock availability, and cost differentials continue to challenge large-scale adoption. This is where transparency, verification, and technical confidence become critical.

As SAF markets mature, the focus must shift from ambition to assurance. At Intertek Caleb Brett, we support SAF growth by providing independent testing, verification, and quality assurance across feedstocks, production processes, and finished fuels. From C-14 analysis to ensure renewable content, to full specification testing and supply chain integrity, we help the industry scale SAF with confidence.