Upgrade the lounge kitchen and and hire a chef to make the flight food on the airport instead of having it delivered to the airport

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.

Even if you have a few seats in business. The planes will be filled as usual while providing better service with almost no additional carbon footprint.

Stand up seats for shorter flights.

Automatic opening of trash-lid on planes with hand gesture above it. Saves excess use of papertowels and bonus: increases hygiene and bacteria spread

Create an ability to share a seat in your car with other passengers on the flight. It's better than everyone riding their car.