SAF traceability in aviation: why it matters as much as the fuel

The core problem: physical SAF remains scarce

Sustainable Aviation Fuel (SAF) is still scarce and expensive, produced in volumes well below demand from airlines and institutional buyers. Production capacity, whether from bio-based pathways or eSAF, is expanding but cannot yet cover full physical supply for most buyers.

This physical constraint forces the market to separate two things: the fuel itself, delivered and burned in a specific aircraft, and the emissions reduction it represents. A buyer can fund SAF production without that exact litre powering their own flight. This is exactly where traceability becomes essential: it links a purchase to a real, documented and attributable emissions reduction.

In this context, the value of a SAF purchase is measured not only in litres delivered but in proof. Companies investing in SAF are primarily seeking to demonstrate, in a verifiable way, the decarbonisation effort made to stakeholders, regulators, customers and investors.

What are the concrete business implications?

Extra-financial reporting obligations, notably under the CSRD, require companies to precisely document their emissions and the reduction actions undertaken. A SAF purchase without solid traceability documentation cannot be reliably integrated into these reports, which undermines the entire sustainability approach.

The same issue arises in carbon accounting, particularly for Scope 3, which covers indirect emissions linked to fuel purchased by an organisation. Without an enforceable, verifiable certificate, a company cannot prove to an auditor or business partner that the claimed reduction is real.

The main risk is greenwashing, whether intentional or not. Communicating about SAF use without properly traced environmental attributes exposes a company to having its claims challenged, with reputational and sometimes legal consequences.

Without a verifiable certificate, a SAF purchase cannot be claimed as an enforceable emissions reduction.

What certification mechanisms exist today?

Sustainability certificates

Sustainability certificates confirm that a given volume of SAF meets specific production criteria: feedstock origin, emissions reduction performance, and compliance with applicable sustainability criteria. They are the reference document linking a purchase to a recognised emissions reduction.

Trading environmental attributes

Environmental attributes allow the physical molecule to be separated from its associated decarbonisation value, so that value can be transferred to a buyer who does not directly receive the fuel. This mechanism, still maturing in the SAF market, requires reliable registries to prevent any double counting.

Independent third-party audits

Audits conducted by independent third-party bodies confirm that claimed emissions reductions correspond to a physical, documented reality, from feedstock to delivery. They are the link that gives the entire certification chain its credibility.

How to choose the right traceability approach

The first step is to check which certification standards the supplier relies on, such as ISCC or RSB, which govern sustainability criteria and verification methods for SAF. These frameworks do not all cover the same criteria, so it is worth understanding precisely what each one guarantees before committing.

The second point to check is alignment with applicable regulations, notably ReFuelEU Aviation, which sets SAF blending obligations for suppliers and European airports. A buyer must ensure the documents provided will actually meet these obligations, not just an internal commercial goal.

Finally, supply chain transparency remains the deciding factor: a supplier able to trace every step, from feedstock to certification, significantly reduces the risk of later errors or disputes. A few questions help structure this verification:

• Which certification standard covers this SAF volume?
• Who performed the audit, and at what frequency?
• Are the environmental attributes recorded in a recognised registry?
• Are the documents compatible with ReFuelEU Aviation requirements?
• Is the supply chain documented end to end?

How Heeding supports this process

Heeding is a sustainable fuels marketplace that gives access to offers from multiple producers and distributors, without selling fuel under its own name. This lets buyers compare available volumes, prices and associated certifications, instead of depending on a single supplier or contacting each producer individually.

Beyond comparing offers, the platform centralises information and allows direct online ordering. More importantly, it gives access to the traceability documents and information tied to each order, which simplifies building the evidence file needed for CSRD audits and Scope 3 carbon accounting.

Heeding does not favour any single technology: the relevance of SAF, eSAF or another solution depends on each buyer's fleet, usage patterns and operational constraints. Heeding's Flash Diagnostic is designed precisely to analyse these parameters before committing to a purchase.

Securing proof as much as supply

As long as physical SAF remains limited, certification and traceability are the market's real currency. A litre of SAF without verifiable documentation holds only partial value for a company subject to reporting and carbon accounting obligations.

Buyers who structure their verification method now, standards, audits, registries, will spare themselves difficulties during future regulatory checks. Heeding's Flash Diagnostic assesses your fleet and needs to secure both supply and compliance documentation.