KLM Royal Dutch Airlines (Amsterdam) stated yesterday (March 18) it wants to operate biofuel flights from 2011 according to this Reuters report.
Last November, during a 1.5 hour KLM flight above the Netherlands, one engine of a Boeing 747-400 flew on a mixture of 50 percent sustainable biofuel and 50 percent on traditional kerosene. The other three engines ran on 100 percent normal kerosene.
Read the full Reuters report: