Air travel

How do we clean up air travel? Fuel from fast-food grease is just the start

With demo flight, United Airlines helps chart a path for using 100% sustainable aviation fuels.

Maria Gallucci  . 

A December 2021 United flight from Chicago to Washington, D.C. carrying more than 100 people was the first passenger flight to use only "sustainable aviation fuels" in one of its two engines. (United Airlines)