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

And give more SAS bonus points to travelers who book with biofuel. Incentives!

Let people on the plane as they are seated, start with A and F, then B and E, and then C and D at last.

Stand up seats for shorter flights.

Have a separate bin to put old baggage tags and recycle them. Not together with ordinary waste.

Present sustainability data for the flight in the infotainment system, with for instance bio-fuel stats, # meals pre-selected and how much carbon emissions was saved.