Reuters: Biofuels could be used to fly commercial airlines within the next decade as a viable alternative to kerosene, although costs and concerns over environmental impact remain big barriers. Airlines including Virgin Atlantic, Continental, Air New Zealand and Japan Airlines have already flown on routes with one engine part-powered by a range of biofuels including algae and jatropha. Jatropha, a poisonous plant that produces seeds that can be refined into biofuels, is being touted as …