In small airports, like Vigra, where there only 1 or 2 airplanes stand, have roofs like carports to prevent snow on plane. This will reduce amount of deicing fluid needed.

Include a minimum of 50% bio-fuel for all SAS Business seats. Market it as a part of business being reintroduced in Europe. A win-win, for both customers and airline.

Complimentary Arlanda Express ticket when booking a flight to/from Stockholm

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.

Let the captain thank the x number of passenger on board that added bio-fuel on the ticket.

Reduce food waste by dropping vegan food that nobody eats