On the Horizon, Planes Powered by Plant Fuel. Agriculture and Farming, AIRLINES AND AIRPLANES, Alternative and Renewable Energy, Biofuels, Ethanol, Fuel Efficiency, Greenhouse Gas Emissions, Oil (Petroleum) and Gasoline, Vilsack, Tom, AIRBUS INDUSTRIE, Boeing Company, Deutsche Lufthansa A.G, Frankfurt (Germany), San Diego (Calif)