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

Stop handing out plastic cups for canned drinks such as sodas, beer, and water. Unless the passenger asks for it. Reduces the number of unused cups that are thrown away.

Serve only ecological wine/champagne including long-haul business class no exceptions, brand SAS as world's first 100% ecological wine airline.

Use modern IT to implement dynamic codesharing, providing an interline journey following an optimized flight plan, rather than a static agreement.

Change the paper dispensers in the lavatories, often many tissues come at a time. Get single tissue dispensers. Save paper and avoid overfilled bins that looks untidy.

Implement sharkskin technology or (my own) coating to reduce air resistance and micro-drag from the fuselage.