Understanding SAF: A Primer for UHNW Fleet Owners

Sustainable Aviation Fuel (SAF) has moved from environmental discourse to operational reality. In 2026, the most modern thing about a private jet is no longer the cabin Wi-Fi or the in-flight shower—it is the fuel.

For UHNW fleet owners, understanding SAF is no longer optional. Here is what you need to know.

What Is SAF?

SAF is a drop-in alternative to conventional jet fuel, produced from renewable or waste-based sources. It meets the same rigorous specifications as fossil-based kerosene (ASTM D7566) and can be blended with conventional fuel up to 50% without any modifications to aircraft or infrastructure.

The most common production pathway today is HEFA (Hydroprocessed Esters and Fatty Acids) , which uses feedstocks such as used cooking oil, animal fats, and agricultural residues. Emerging pathways include Alcohol-to-Jet (AtJ) and Power-to-Liquid (e-SAF) , though these remain at earlier stages of commercialisation.

The Regulatory Landscape

SAF is no longer a voluntary choice—it is becoming a compliance requirement:

EU ReFuelEU: 2% SAF mandate in 2025, rising to 6% by 2030, and 20% by 2035.

CORSIA: The first phase (2024–2026) is voluntary, but the second phase becomes mandatory from 2027. SAF is recognised as a CORSIA-eligible fuel that can reduce offsetting requirements.

UK and EU Member States: Currently participating in CORSIA, with domestic mandates also in place.

For private operators, this means that SAF procurement will increasingly affect operational costs and compliance exposure.

SAF Availability for Private Aviation

SAF availability for the private aviation sector is expanding, but remains constrained. Major charter operators—including Luxaviation, Air Partner, and Wheels Up—now offer SAF options to customers.

Long-term commitments are also emerging. In 2025, Luxaviation signed a 15-year agreement to purchase 10,000 tonnes of synthetic SAF (eSAF) starting in 2029. This signals that the supply pipeline is building—but for now, spot availability is limited and pricing is at a premium to conventional jet fuel.

The global SAF market is projected to grow from USD 4.86 billion in 2026 to USD 31.45 billion by 2031, a compound annual growth rate of 45.3%. This growth will bring more supply, but also more regulatory complexity.

What This Means for Your Fleet

For UHNW fleet owners, the key considerations are:

• Compliance Readiness: If your aircraft operate in or through EU airspace, SAF mandates will affect your fuel uplift requirements.

• Operational Flexibility: Securing SAF supply—whether through term contracts or spot purchases—will become increasingly important.

• Carbon Reporting: For Family Offices with ESG commitments, SAF provides a credible pathway to reduce Scope 1 emissions.

• Asset Value: As mandates tighten, aircraft that are SAF-compatible (all modern jets are) will retain value—but operators with proactive SAF strategies may have a competitive advantage.

A Note on e-SAF

Synthetic SAF (e-SAF) is produced from renewable electricity, green hydrogen, and captured CO₂. It offers the highest emissions reduction potential but remains significantly more expensive than HEFA-based SAF. The Luxaviation agreement signals that e-SAF is entering the market, but widespread availability is still years away.

The Bottom Line

SAF is not a trend—it is a transition. For UHNW fleet owners, the question is not whether to engage with SAF, but how strategically.

SLG provides independent, conflict-free advisory on SAF procurement and regulatory compliance for private fleet owners.

Contact us for a confidential discussion.