Air New Zealand says it plans to mount the first test flight of a commercial airliner partially powered by biofuel. The 747 flight is one part of a deal signed by the airline, engine producer Rolls-Royce and aircraft manufacturer Boeing to research "greener" flying.  Air New Zealand's chief executive Rob Fyfe said that advances in technology had made biofuels a viable possibility for use in aviation sooner than anticipated.
http://news.bbc.co.uk/2/hi/science/nature/7017694.stm