Flying with free cargo space is a waste. I think SAS should start offering logistics companies air freight solutions. You can make money and save the earth - a win win.

Allow free rebooking on the day of departure to a shorter route or a route with less stops when available, even in low booking classes and without status.

Sell biofuel to companies in bulk to lower their CO2 emissions and fast track the green transition. This would simply corporate action and speed up climate transition.

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.

Make more out of every trip - it's not all about reducing the emissions but making every trip worth it. Sustainable travel is when the trips you make are worth it.

Free reebooking to earlier flight when avilable. Result in filling up seats, and making it more likely to fill up seats on later flights