The synthetic kerosene was produced by INERATEC, blended with fossil kerosene by MB Energy, and refueled into the aircraft at Schiphol Airport. Synthetic sustainable aviation fuel is made using renewable electricity, CO₂, and water, and can reduce lifecycle emissions by more than 90% compared to fossil kerosene.

KLM already pioneered this in 2021 by operating the first commercial flight using synthetic kerosene to Madrid. Whereas 500 liters of e-SAF could be blended then, only 200 liters are being used now. This shows how great the challenge is: the availability of e-SAF still lags far behind ambitions. Today, only a fraction of the e-SAF mandate imposed by Europe for 2030 is actually in production. Making e-SAF widely available and affordable on a large scale remains, alongside SAF, a major challenge.