SAF Book-and-Claim Explained: Buying Environmental Attributes Without Physical Fuel

SAF book-and-claim allows a buyer to acquire specified environmental attributes associated with sustainable aviation fuel supplied elsewhere. The buyer’s own aircraft does not have to receive the corresponding physical fuel. A credible system connects the attributes to qualifying production and supply evidence, records their ownership and prevents them being sold or claimed incompatibly more than once.

It solves a practical problem: qualifying SAF may be available at one location while the aircraft needs fuel at another. But the mechanism also creates an accounting question. If the fuel and its attributes travel separately, what exactly has the customer bought, and what can they say about their flight?

Follow two paths, not one fuel truck

In the physical path, fuel is produced, certified, supplied and used through an aviation fuel chain. In the attribute path, defined information about that qualifying fuel is registered, transferred and eventually retired for an identified beneficiary.

The paths are connected by documentation. They do not have to end at the same aircraft. That is the feature which makes book-and-claim useful, and the reason its claims must be explained carefully.

RSB’s Book & Claim System describes the registration, transfer and retirement of sustainability attributes through defined procedures. “Book-and-claim” is the mechanism, however, rather than the name of one universal rulebook. Different systems can have different eligibility conditions, unit definitions and requirements.

If a charter provider offers a “SAF contribution”, ask whether it means physical supply, a certificate purchase, a future commitment or something else. Those are different arrangements, even if the invoice uses the same broad label.

How a transaction works

Qualifying fuel and supporting evidence

The starting point is evidence of qualifying fuel rather than an unsupported promise to buy it later. The relevant system establishes which fuels, certification schemes, supply events and documentation are eligible for registration.

The details matter because the attribute is only as credible as its underlying record. A certificate should have a traceable connection to the fuel quantity and environmental information it represents. Technical fuel quality, sustainability certification and the registry entry perform related but different jobs.

Issuance and transfer

Once eligibility requirements are met, units can be issued into the registry. The holder may transfer those units through the permitted chain to the organization buying the attributes. Records identify what is held, by whom and under which conditions.

Issuance is not yet the final claim. A purchaser might own units but still need to retire them within the relevant timeframe, name the correct beneficiary and satisfy its reporting framework. Paying an invoice and receiving a retirement record are not the same event.

Retirement for a beneficiary

Retirement takes units out of circulation for the stated purpose and beneficiary. The point is to prevent the same unit being traded again after it supports a claim. The record should make clear which entity benefits, for which period and in what amount.

The SAFc Registry’s retirement guidance illustrates how beneficiary designations are handled within one system. Buyers should obtain the applicable retirement evidence, not assume that a supplier’s general sustainability statement identifies their purchase.

What does the buyer actually acquire?

The buyer acquires the attributes specified by the contract and scheme. That could be expressed through a fuel quantity, an energy quantity, a calculated greenhouse gas benefit or a unit representing particular components of the environmental information.

A quoted “tonne” therefore needs a noun after it. Does it mean a tonne of neat SAF or a tonne of CO2-equivalent reduction? Those quantities are connected by a calculation, but they are not interchangeable.

A passenger does not need to become a registry administrator to understand the purchase. They should nevertheless receive a clear explanation that can be reconciled to the records held by their provider.

Why buy attributes rather than move the fuel?

Physical supply is uneven. Moving a relatively small quantity of SAF to every airport used by every business jet may be expensive or impractical. It can also introduce additional logistics. Book-and-claim lets demand reach qualifying supply without requiring the customer to redesign the trip around a particular fuel location.

For an operator visiting many destinations, that can simplify access to a fuel-related intervention. For a corporate travel buyer, it can provide a documented way to support qualifying SAF without controlling where its chosen aircraft refuels.

These advantages do not prove that every purchase creates new production. Whether an intervention has additional impact beyond what would otherwise happen is a separate question. Ask how the system treats existing obligations, incentives and the additional demand the transaction is intended to support.

RSB’s additionality discussion shows why those conditions need explicit treatment. A convenient purchasing mechanism and a demonstrated effect on future supply are different propositions.

What double counting means here

“No double counting” is useful shorthand, but several risks sit underneath it. A producer could attempt to obtain more than one set of units for the same eligible attributes. A seller could try to transfer the same benefit to two unrelated customers. A buyer could make a claim inconsistent with a prior compliance use.

Registry controls, audits and retirement procedures are intended to address these risks. A trustworthy system also needs rules for corrections, disputed records and the relationship between multiple registries. A digitally recorded certificate can still depend on incorrect underlying information, so traceability and verification both matter.

In September 2026, IATA published an interoperability framework addressing attributes moving across a market with multiple registries. The work highlights a real issue: a unit should not appear unique in one database while an incompatible copy exists elsewhere.

For the buyer, ask which registry was used, how transfers are controlled and how the supplier checks for overlapping claims. “Stored on a blockchain” or “digitally verified” is not, by itself, an answer to those questions.

Can the operator and corporate customer both report a benefit?

Potentially, within the rules of an applicable framework. An operator’s direct fuel-related accounting and a corporate customer’s indirect travel-related accounting sit at different points in a value chain. Compatible allocation across those scopes is not automatically the same as selling the same customer attribute twice.

Some certificate systems explicitly distinguish components associated with air transport providers and aviation customers. The SAFc Registry’s explanations of its certificate types provide one example. That does not mean every buyer can claim every component, or that a certificate’s labels override the requirements of an external reporting standard.

The purchasing organization should establish its objective before buying. A passenger wanting to support SAF uptake may need different documentation from a listed company seeking an assured inventory disclosure.

A sustainability team, finance team and auditor should agree how the intervention will be presented rather than leaving that decision to a booking confirmation.

A practical example of what can be said

Imagine a fictional company buys attributes associated with qualifying SAF supplied to a different airport from the one its charter uses. The provider retires the eligible units for that company under the agreed system and supplies the documentation.

A factual statement might explain that the company purchased and retired specified SAF attributes supporting a calculated lifecycle benefit under the named methodology. It should state that the arrangement was book-and-claim where that is material to understanding the purchase.

It would be misleading to describe the record as proof that the charter aircraft’s tanks contained that physical SAF. Nor does it establish that the journey had no emissions. Whether the benefit may appear within a corporate inventory, target calculation or separate disclosure depends on the relevant framework.

The World Economic Forum’s SAFc accounting work with RMI and PwC illustrates the need for a consistent approach across the value chain. Buyers still need to check the version and rules applicable to their own reporting use.

Questions to ask before buying

Start with the purpose: are you supporting production, purchasing a defined attribute for disclosure, meeting an accepted reporting objective or combining several aims? Then ask the supplier to match the documentation to that purpose.

• What qualifying fuel and supply event underpin the units?
• Which sustainability certification and registry rules apply?
• How were quantity, lifecycle intensity and the baseline established?
• Which attributes are included, and are any excluded?
• How are government obligations and incentives treated?
• Who is named as beneficiary, and when will retirement occur?
• Which reporting uses are supported, and which are not?
• What happens if the underlying record is corrected or becomes ineligible?

Keep the contract, invoice and retirement evidence together. A supplier’s attractive passenger certificate may summarise the purchase, but the supporting records need to explain how the summary was produced.

Book-and-claim should also be distinguished from carbon offset purchases. Both can involve a registry and retirement, but they represent different interventions and should not be swapped without explaining the change.

Frequently asked questions

Will my aircraft receive SAF?

Not necessarily. Book-and-claim is designed to separate the environmental attributes from physical delivery. If you require physical uplift as well, that must be arranged and documented separately.

Is a SAF certificate a carbon offset?

A SAF certificate is distinct from a carbon offset credit. It represents specified attributes associated with qualifying aviation fuel under a particular system. An offset credit usually represents a separately quantified emission reduction or removal from a credited activity.

What does certificate retirement mean?

It means the relevant units are removed from further circulation for a stated purpose and beneficiary. Retirement supports exclusive use under the system’s rules, but the buyer must still satisfy any external reporting requirements.

Is book-and-claim accepted in every reporting framework?

No universal acceptance should be assumed. Registry eligibility, voluntary reporting, regulatory schemes and target-setting rules can differ. Confirm the intended treatment before purchase and retain the evidence supporting it.