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.

And give more SAS bonus points to travelers who book with biofuel. Incentives!

In Plus and Business on long haul - hand out amenity kits by request instead of placing them on all seats.

More variation in aircraft sizes = optimized cabin factor = less fuel consumption/passenger

Do not carry tax-free goods on flights. Use as online service and if necessary in partnership with partners allowing pick-up at airports.

Reduce food waste by dropping vegan food that nobody eats