Travelers register final destination, SAS sends taxi sharing offers via SAS transfer = lower taxi costs and individual receipts for passengers.

Solar panels to generate energy

Implement the potential to offset carbon footprint by CDR technologies like enhanced rock weathering;

Find ways to allow tax-free purchases to be done in departing airport and to be picked up at the airport were I land. It could save a lot of weigh/fuel.

Offer an educational series during the flight about climate change and what passengers can do to help.

Bio fuel / green fuel as default, and having to pay more as a passenger if you want to fly on fossil based airplane fuel.