Be awarded with points or higher status level when choosing a more eco friendly flight ticket

Cut the knives and fork in the breakfast box, we only need spoon for yoghurt. There's no need for one glass per item

Adopt single-engine taxiing to save fuel during ground operations.

Use travellers feces from flights as a bioproduct. As fuel or to something else useful.

Ask gold members how much luggage they plan to bring to plan for correct weights. A lot of business travels include 3 checked bags but the majority flies with handluggage

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.