It is easy to underestimate aviation emissions.
For many companies, flights are just a line item inside a travel policy. A necessary part of sales, conferences, investor meetings, supplier visits and global operations. Nobody owns the aircraft. Nobody buys the fuel. Nobody sees the emissions until they appear in the annual carbon account.
And then the problem becomes obvious. Business travel and air freight can be material, visible and hard to reduce without changing how the company operates.
For an ESG lead or CFO working toward net zero, that is an uncomfortable place to sit. Aviation usually lives in Scope 3, outside direct operational control, yet firmly inside the numbers leadership has to stand behind.
That is why Sustainable Aviation Fuel certificates, or SAFc, are starting to matter. Not because they solve aviation overnight. They do not. But because they give companies a way to support aviation decarbonisation inside the aviation system itself.
They separate the fuel from the claim
The basic idea behind SAFc is simple. Sustainable Aviation Fuel is produced, blended and used somewhere in the aviation fuel system. The environmental attribute linked to that fuel is recorded separately. A company can then buy and retire that attribute, even if the physical fuel was not used on its own flight.
This is called book-and-claim.
It exists because aviation fuel logistics are not built around individual corporate buyers. Fuel is delivered to airports, blended into supply systems and used across aircraft fleets. Trying to physically match each litre of SAF to one company's flight would add cost and complexity without necessarily adding climate value.
Book-and-claim makes the market more practical. The fuel goes where it can be used efficiently. The verified environmental benefit goes to the buyer who paid for it.
They are not offsets in disguise
This distinction matters. A SAF certificate is not the same as a generic carbon offset from an unrelated project. It is connected to a specific aviation fuel intervention.
The company is not claiming that the flight had no emissions, or that aviation has been fully decarbonised. It is claiming that a verified amount of lower-carbon aviation fuel was used in the system, and that the associated environmental attribute has been allocated to the company.
That is a narrower claim. And usually a better one, because the strongest climate claims are not the broadest. They are the ones that can be traced, explained and defended to an auditor or a board.
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They create demand where the market needs it
SAF is still expensive. Supply is still limited. Production pathways are still developing. And large-scale projects need confidence that demand will exist beyond regulation.
This is where corporate buyers can play a useful role. A company buying SAFc is not just purchasing a reporting instrument. It is also sending a demand signal into a market that needs long-term customers to scale.
Aviation has fewer near-term decarbonisation options than many other sectors. Batteries and hydrogen may play a role over time, but liquid fuels remain central for long-haul flying. SAF is therefore one of the most practical levers available today for an aviation-heavy ESG strategy.
The value of a SAF certificate is not only the emission reduction. It is the confidence that the reduction can be claimed without creating new risk.
They reward discipline, not enthusiasm
A credible SAFc purchase needs more than a certificate and a nice PDF. It needs a clear chain of evidence: where the fuel was produced, what feedstock was used, which certification and registry apply, who retired the certificate, and whether anyone else can claim the same benefit.
That is a procurement discipline in its own right, and it is the part most companies underestimate. We look at how to evaluate and buy SAFc well in a separate piece.
They are a bridge, not the destination
The best way to think about SAFc is as a transition tool. They help companies act while the aviation sector builds the infrastructure, supply chains, standards and production capacity needed for deeper decarbonisation.
That is valuable. But it also means buyers should avoid treating SAFc as a permanent substitute for operational change. Travel policies still matter. Freight choices still matter. Supplier engagement still matters. Reducing unnecessary flying still matters. SAFc should sit inside a broader aviation strategy, not outside it.
For companies with meaningful travel or air freight emissions, the real question is not whether to buy SAFc, but what would make a SAFc purchase credible enough to sit inside a net zero or SBTi-aligned strategy.
Refine helps companies answer that question before they enter the market.
