Sustainable aviation fuel is made of used cooking oil, waste animal fat, and a small amount of synthetic kerosene made from waste corn.
On November 28 a Virgin Atlantic Boeing 787 with two Rolls-Royce Trent 1000 engines flew from London to New York in about 8 hours powered entirely by SAF. While the SAF is three to five times more expensive than ordinary JP-4 the flight was apparently meant to prove a point, that it's possible to eliminate the 2-3% of atmospheric CO2 produced through commercial aviation by using the filtered grease that once cooked french fries and fish filets.
aviationnewsource.com
One of the most important aspects of commercial jet engine design has been fuel economy, engines must use the minimum amount of fuel to get from point A to point B. This line of thinking has been suspended to mollify the climate paranoids until passenger aircraft are powered by batteries or some other revolutionary process.
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