The US Navy is testing a 50/50 alcohol-to-jet (ATJ) fuel produced by Gevo Inc. for use with their F/A-18 “Hornet” jets. They recently announced their first successful supersonic flight using Gevo’s ATJ fuel derived from isobutanol.
You can read Gevo’s press release here.
Gevo is an affiliated member of NARA. For NARA, they are adapting their ATJ technology to use the simple sugars contained in forest residuals as a feedstock for isobutanol production. NARA plans to conduct a demonstration flight using biojet fuel made from forest residuals within the next year.