Donate unused food and beverages after flights and try to get closer to zero food waste.

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.

I would use my skills in optimization and deep learning to learn what frequenzies and time schedules that maximizes the load factor of each aircraft in the fleet.

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

Include BIO-tickets in Friends & Family campaigns.

Innovations such as 3D food printing, which can create meals with precise portions and minimal waste.