Separate the salt and pepper from the rest of the table set. Way too often it's just thrown away.

SAS should incentivize off-peak flights. Lower ticket prices on empty aircraft will reduce peak demand and the emissions caused by congestion and delays.

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.

Let people on the plane as they are seated, start with A and F, then B and E, and then C and D at last.

Veggie first airline should be implemented. Not only for Sustainability reason, also to meet the modern traveler expectations

Allow users to visualise their travel carbon footprint in-app. Include everything such as transportation to/from the home and destination, hotels.