At check-in and at kiosk ask if they really need paper boarding card or can use SAS app instead.

Meals included in the ticket fare are by default vegan (should be cheaper for SAS) and if meat dish is desired then it is a special order at an additional cost.

When the crew collects trash before landing, why not make separate rounds for collecting, cans, plastic cups, paper, etc instead of collecting all trash in the same bin.

Innovations such as 3D food printing, which can create meals with precise portions and minimal waste.

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.

Eliminate plastic bottles by installing onboard refill stations for reusable water bottles, encouraging passengers to bring their own bottles, and reducing plastic waste.