Taxiing from and to gates from runways should be more smooth and with less fuel - using for example AI

Flying with free cargo space is a waste. I think SAS should start offering logistics companies air freight solutions. You can make money and save the earth - a win win.

Award additional EuroBonus bonus and/or level points when renting an electric vehicle through a car rental partner such as Hertz, Avis or Sixt.

Incentivize sustainable behavior, e.g. a small reward for bringing your own coffee cup. This can also be sold by SAS in the Eurobonus store or in flight.

Create an ability to share a seat in your car with other passengers on the flight. It's better than everyone riding their car.

Replacing the paper catalog with a QR code sticker. This saves tons of paper. Many catalogs are destroyed or unread.