First Commercial Biofuel Flight
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2011
year
KLM operated the first commercial flight using biofuel on June 29, 2011, from Amsterdam to Paris using a 50% cooking oil blend.
Explanation
The Boeing 737 flew with one engine running on a 50/50 blend of used cooking oil and conventional jet fuel. This milestone demonstrated that sustainable aviation fuel (SAF) could work in existing engines without modification. SAF is now considered the primary pathway to reducing aviation's carbon footprint, though production remains limited to less than 1% of total jet fuel consumption.