KLM doubles sustainable fuel surcharge to cover cost of more SAF

The Dutch carrier in January 2022 added a surcharge of between €1 and €12 ($1.09-$13.09), depending on distance flown and cabin class, to tickets from Amsterdam, to help fund the use of a 0.5% SAF blend on all Schiphol-departing flights. 

 https://runwaygirlnetwork.com/2023/05/klm-doubles-sustainable-fuel-surcharge/