The airline Air France wants to increase ticket prices because of the use of up to one percent biofuel.
The price per ticket increases by up to four euros for economy class and up to twelve euros for business class, Air France announced on Monday.
The vegetable oil-based fuel is used on flights from France and the Netherlands.
Last October, the European aircraft manufacturer Airbus started a series of tests with sustainable kerosene (SAF - Sustainable Air Fuel), which was mainly made from old cooking oil. The tests are scheduled to continue until mid-2023. The use of biofuel is intended to reduce the emission of greenhouse gases that drive climate change.
The proportion of sustainable fuel should be between 0.5 and 1 percent of the total fuel, said Air France.
In addition to Air France, this also affects the Dutch KLM and the airline Transavia.
The cost of the fuel accounts for around 20 to 30 percent of the costs for the airlines.
Biokerosene is currently four to eight times more expensive and is only produced in small quantities.
Air France is also asking passengers to make voluntary donations in order to buy more sustainable fuel.
In France, a one percent share of biokerosene in fuel for aircraft has been mandatory since the beginning of the year.
The EU Commission would like to expand the proportion within the framework of the "Fit for 55" program to two percent by 2025 and 63 percent by 2050.
Global air traffic currently accounts for up to three percent of CO2 emissions.
In 2019, the share of sustainable fuel in air traffic was 0.1 percent of the total consumption of 360 billion liters.