My understanding is that the FAA at least understands how critical this could be and is already working with ASTM and researchers on this. Also I think if ASTM certifies a fuel to the "JET A" standard, nothing else would be required from the FAA. They don't certify fuels, they certify airplanes, which come with a specified fuel requirement from the factory, which would be reference an ASTM standard (or equivalent standard for Russian, etc fuels)