When I am flexible for when to fly, I would be open to SAS selecting the actual flight, getting to fewer, fuller flights.

Allow users to visualise their travel carbon footprint in-app. Include everything such as transportation to/from the home and destination, hotels.

Require everyone to pre-order meals, snacks and drinks so that the plane can carry just the right amount of food and drinks.

Make it possible to buy bio fuel for past trips.

Cut the knives and fork in the breakfast box, we only need spoon for yoghurt. There's no need for one glass per item

Use modern IT to implement dynamic codesharing, providing an interline journey following an optimized flight plan, rather than a static agreement.