Singapore Airlines(SIA) and the Civil Aviation Authority of Singapore (CAAS) are collaborating on a series of "green package" flights on the carrier's San Francisco-Singapore route.

The programme, which began on 1 May, runs for three months and involves 12 flights, saysSIA. It will involve the use of air traffic control optimisation, as well as a mix of biofuels and normal aviation fuel.

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The aim is to explore ways to reduce fuel burn and carbon emissions.SIAoperates the Airbus A350 aircraft on the route.

“SIA’s fleet is already among the most modern and fuel-efficient in the world," saysSIAchief executive Goh Choon Phong."We now want to push ourselves further and are embarking on this initiative to help promote the use of sustainable biofuel in an operationally and commercially-viable manner. This is in line with our long-term commitment to further reduce carbon emissions while improving the efficiency of our operations.”

The initiative falls under the auspices of the Singapore government's efforts to improve sustainability.