Let the customer choose different carbon off-sets upon purchase of tickets. It can also include options that boost great projects.

For every mile the aircraft flies overseas, SAS commits to a certain amount of plastic being removed from that ocean.

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.

Drop food and snack service on all domestic flights (<1 hour), only coffee, tea and water. Both plus and go

Use travellers feces from flights as a bioproduct. As fuel or to something else useful.

Let it be easy to take steps when buying bio-fuel.