I’m not sure we know that answer yet. Virgin made plans in 2008 to test up to 8 different biofuels (likely plant based biodiesels), after ruling out ethanol. They have been and will be looking over the next few years into which ones perform best at the altitudes required for flying a commercial jet. I guess stay tuned to what they find out and we should have our answer.
As another alternative, how about solar powered planes. While it may not be sufficient for commercial flights, perhaps it could be a useful tool for individual pilots who have up to six seater planes.
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