The signatories ask that the obligation of the mandate be placed on the fuel supplier, to ensure equal treatment. They also say that advanced biofuels allowed under the mandate must be sustainable, and should exclude biofuels from dedicated cropland. The letter is signed by T&E and Natuur & Milieu; airlines Easyjet, Ryanair, Wizz Air, Jet2, Loganair; fuel producer SkyNRG; and planemakers Pipistrel and Wright Electric.
