The Dutch airline KLM says it plans to use recycled cooking oil on 200 flights between Paris and Amsterdam. The fuel, biokerosene, is derived from used frying oil, which has to be tested to meet the same technical specifications as traditional kerosene.
Airlines are under EU pressure to cut their carbon emissions by 3% by 2012.
This isn't the first time KLM have tried alternative fuels. Last year they attempted a Transatlantic crossing in a Boeing 747 powered only by methane, the cows stored in the hold and fed high-yield grass. However the plane only managed 12 metres before local residents complained of the smell.
And tests were done using recycled homeless people, called Tramp-oline, but these, too, didn't get off the ground.
Ireland have offered their expertise in helping to discover new options. They are currently importing several million tons of sand from Saudi Arabia to Dublin, with the intention of drilling for oil.