50. Sustainable Aviation Fuel (SAF): Marketing vs. Reality

If you have booked a flight recently, you have likely seen a prompt to “offset your carbon footprint” or purchase a “green fare” attributed to Sustainable Aviation Fuel, or SAF. Airlines are aggressively marketing SAF as the solution to guilt-free flying. While the technology is promising, the gap between the marketing brochures and the current reality of aviation infrastructure is vast. Here is what is actually going into the fuel tank versus what is being advertised.

What is Sustainable Aviation Fuel?

Before dissecting the marketing, it is important to understand the product. SAF is not a new type of engine technology like hydrogen or electric propulsion. It is a liquid fuel that is chemically similar to conventional fossil-based jet fuel (kerosene).

The difference lies in the source. Instead of refining crude oil drilled from the ground, SAF is produced from renewable resources. Common feedstocks include:

• Used Cooking Oil (UCO): Waste oil and animal fats from restaurants.
• Municipal Solid Waste: Trash from homes and businesses.
• Agricultural Residue: Corn stover or forestry waste.

SAF is considered a “drop-in” fuel. This means it can be mixed with regular jet fuel and used in existing aircraft engines without any mechanical modifications.

The Reality: The 0.1% Problem

The marketing materials often imply that green flights are a widespread reality today. The data tells a different story. According to the International Air Transport Association (IATA), SAF production in 2023 reached approximately 600 million liters (158 million gallons).

While that sounds like a large number, it accounts for only 0.2% of global jet fuel use.

The Supply Bottleneck

Currently, there is simply not enough SAF to power the world’s fleets. If every drop of SAF produced today were pooled together, it would barely keep global aviation running for a few hours.

Major producers like Neste are ramping up production, and new plants are opening in the US and Europe. However, scaling up from 0.2% to the industry target of 10% by 2030 requires a massive infrastructure expansion that has not happened yet.

The Blending Limit

Even if the supply existed, regulations currently prevent flights from running on 100% SAF. Safety standards generally limit the blend to 50% SAF and 50% conventional jet fuel.

While Virgin Atlantic successfully flew “Flight 100” from London to New York on 100% SAF in November 2023, this was a permit-based demonstration flight. Commercial passengers are currently flying on a blend that is overwhelmingly fossil-based.

The Cost Factor: Who Pays the Premium?

Economics is the second major hurdle separating reality from marketing. SAF is significantly more expensive to produce than standard kerosene.

• Jet Fuel Price: Historically fluctuates around \\(800 to \\\)1,000 per metric ton.
• SAF Price: Typically ranges from \\(2,000 to \\\)3,000 per metric ton.

Because SAF costs two to three times as much as fossil fuel, airlines cannot switch over without raising ticket prices. This is why you see “Green Fares” or voluntary contributions during checkout. The airlines are passing the cost of this premium fuel directly to the consumer.

Greenwashing: The "Book and Claim" System

This is where the marketing becomes murky. When you pay extra for SAF on your specific flight, say from Chicago to Paris, that fuel is likely not going into the plane you are sitting in.

The industry uses a system called “Book and Claim.”

1. You Pay: You pay a premium for SAF for your flight.
2. The Credit: The airline uses your money to buy SAF at a location where it is actually available (e.g., Los Angeles or Amsterdam).
3. The Usage: That SAF is pumped into a completely different plane at that hub.
4. The Claim: You get the “carbon credit” for the emission reduction, even though your specific plane burned standard fossil fuel.

While this system helps support the overall SAF market, it can feel misleading to passengers who believe their specific journey is green.

Regulatory Crackdowns on Marketing

Regulators are beginning to punish airlines for overstating their environmental progress. The UK’s Advertising Standards Authority (ASA) recently banned advertisements from major carriers including Air France-KLM, Lufthansa, and Etihad.

The ASA ruled that slogans like “Protecting the Future” or “Fly More Sustainably” were misleading because they implied that aviation is sustainable now. The reality is that aviation remains one of the most carbon-intensive transport methods, and the current impact of SAF is negligible on a global scale.

In the European Union, the “Green Claims Directive” is introducing stricter rules. Airlines will soon be required to provide verifiable evidence for any environmental claims, preventing vague marketing about “net-zero” goals that rely on technology that does not yet exist at scale.

The Path Forward

Despite the current gap between marketing and reality, SAF remains the most viable path to decarbonizing long-haul aviation. Batteries are too heavy for transoceanic flights, and hydrogen requires new aircraft designs that are decades away.

Governments are stepping in to force the issue. The EU’s “RefuelEU Aviation” initiative mandates that fuel suppliers at EU airports must blend at least 2% SAF into their fuel mix by 2025, rising to 6% by 2030 and 70% by 2050.

Until those mandates take full effect, travelers should view airline sustainability claims with a healthy dose of skepticism.

Frequently Asked Questions

Is flying with SAF safer than regular fuel? Yes. SAF is rigorously tested and certified. It is chemically almost identical to traditional jet fuel. Because it contains fewer impurities like sulfur and aromatics, it can actually burn cleaner and be better for engines.

Can I choose a flight that uses 100% SAF? No. Currently, commercial aviation regulations limit SAF blends to a maximum of 50%. Most flights that use SAF today are using a blend of 1% to 5% due to supply shortages.

Why is SAF made from cooking oil? Used cooking oil is an excellent feedstock because it is a waste product that already exists. It does not require clearing land to grow crops (like corn ethanol might), which helps avoid competing with food production.

Will SAF make plane tickets more expensive? Likely, yes. As mandates force airlines to use more SAF, the higher cost of the fuel will be factored into ticket prices. Analysts predict this could lead to a steady increase in fares over the next decade.