Guardian: Boeing and Air New Zealand will fly a jumbo jet powered partly by biofuel next month, the two companies announced today. An Air New Zealand jet will leave Auckland on December 3 with a 50-50 mix of jet fuel and oil from jatropha trees, in one of its four engines on a flight designed to show that jatropha biofuel is suitable for use in aviation as well as economical to produce . “This flight strongly supports our efforts to be the world’s most environmentally responsible …