Definition
A jet fuel produced from renewable or non-petroleum feedstocks — such as used cooking oils, agricultural residues, plant oils, municipal waste, or captured carbon — that meets the same performance and safety specifications as conventional Jet A and can be blended with it for use in turbine aircraft engines without engine modification.
Plain English
A jet fuel made from things like waste oils, plants, or rubbish instead of crude oil. It burns the same as regular jet fuel and works in the same engines, but produces less overall carbon pollution across its life cycle.
Context Anchor
Pilots may encounter this term when reading about turbine aircraft fueling, airport fuel availability, airline operations, fuel records, or aviation environmental programs.
Derivation
‘Sustainable’ comes from the Latin sustinere, meaning ‘to hold up’ or ‘to keep going.’ A sustainable fuel is one that can keep being produced without depleting the source — unlike crude oil, which exists in finite supply.
Why Pilots Care
Use may be mandated by future regulations or airline policies and can reduce the net environmental impact of flight operations.
Intuition Check
Do not read “sustainable” as “unlimited,” “automatically harmless,” or “usable in any aircraft.” Here it means an approved aviation fuel made to lower overall environmental impact while still meeting aviation fuel requirements.
Example Sentence 1
The airline announced that all departures from the airport that morning were uplifted with a 30 percent blend of sustainable aviation fuel.
Example Sentence 2
Sustainable aviation fuel is typically blended with conventional jet fuel until engines and infrastructure are fully certified for 100 percent use.