Add green flights on some departures. nothing is served on these flights, only hand luggage is allowed, but you earn more Eurobonus points if you choose such a departure.

Encourage food suppliers and distributors to use more sustainable and healthy packaging in the food that gets served.

When I am flexible for when to fly, I would be open to SAS selecting the actual flight, getting to fewer, fuller flights.

Allow lounge guests to opt-out of onboard service and bring their meal and drink to the aircraft

Stand up seats for shorter flights.

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