Encouraging standardized suitcase measurements and/or using AI to plan and stack luggage for saving space and even out the plane in regards to weight.

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Experience luxurious, eco-friendly travel by flying with sustainable fuel, earning rewards, and enjoying green packages with certified transport and hotels.

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

Implement sharkskin technology or (my own) coating to reduce air resistance and micro-drag from the fuselage.

Travel light = bring less than 8 kg. If you do so, you should be rewarded with points. If not, SAS will use the extra money you have to pay for sustainability investments.