In M class on Intercontinental flights reduce the usage of plastics, ask the passenger to keep their glass for the entire flight before collecting it for recycling.

Find ways to allow tax-free purchases to be done in departing airport and to be picked up at the airport were I land. It could save a lot of weigh/fuel.

SAS should encourage the last lounge guests to take leftover food, minimizing waste and promoting sustainability in their lounges.

Possibility to book and pay a trip with a certain mileage accrual, tell SAS that you do not want to fly the trip and receive the miles and segments even without flying.

To increase loadfactor, sell standby memberships to youth passengers who are by nature more flexible. Stable revenue for SAS, increased load factor, more youth mobility.

Redesign eurobonus to demand responsible travel. New tier with exceptional benefits: upgrade vouchers, complimentary upgrades, extra award flight access etc.