Sustainable fuel allows airlines to reduce carbon emissions by 75 percent compared with kerosene.

Air France-KLM said Monday it would add a surcharge of up to 12 euros ($13,50) on its tickets to try to offset the cost of using more expensive sustainable aviation fuel.

Air France said that the fuel levy would be added to tickets from January 10.

Travellers in economy class will pay between one and four euros more while those in business class will pay between 1.5 euros and 12 euros, depending on the distance to their destination, it said in a message to its clients.

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