Last Thursday, KLM Royal Dutch Airlines Flight 642 completed the seven hour and 17 minute flight from New York’s JFK Airport to Amsterdam Airport Schiphol using sustainable biofuels. Flight KL642, operated by a Boeing 777-200, will fly every Thursday fueled by recycled cooking oil as part of the Dutch carrier’s goal to have one percent of its flights operate on biofuels by 2015.

For five years, KLM has experimented with various forms of biofuels in order to try to reduce its carbon footprint. First was the attempt to fuel 12 Fokker-50 planes with algae-based biofuel. Bio-kerosene was an experiment a year later, and as many as 200 short hop flights are now powered by a 50-50 blend of kerosene and recycled cooking oil.