FILE - In this July 28, 2010 file picture planes of German Lufthansa are parked at Munich's airport. Germany's biggest airline, Deutsche Lufthansa AG, says it has begun trial flights using biofuels in... more 
FILE - In this July 28, 2010 file picture planes of German Lufthansa are parked at Munich's airport. Germany's biggest airline, Deutsche Lufthansa AG, says it has begun trial flights using biofuels in a bid to reduce carbon dioxide emissions. Lufthansa said Friday July 15, 2011 that an Airbus A321 flying the Hamburg-Frankfurt route four times daily will use a 50/50 mix of regular fuel and biosynthetic kerosene in one of its two engines for the next six months. The airline says during the test period the use of biofuel will reduce CO2 emissions by up to 1,500 tons. (AP Photo/dapd/ Joerg Koch,file) less 
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Associated Press | Photo By dapd/ Joerg Koch,file
Fri, Jul 15, 2011 9:43 AM EDT