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.

Remove the disposable earphones in SAS Go. Offer them on request. Install Bluetooth audio so that pax can connect their own wireless headphones to the IFE system.

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.

Let people on the plane as they are seated, start with A and F, then B and E, and then C and D at last.

A lot of ground equipment is still driven by internal combustion engines, and can be upgraded to run on electric instead for better efficiency.

Replacing the paper catalog with a QR code sticker. This saves tons of paper. Many catalogs are destroyed or unread.