Window shades down when parked at warm days. Keep the fuselage cooler. Experienced it domestic USA and it works

Giving an incentive and getting more passengers to travel light should reduce aircraft loading and fuel consumption. Alternatively allow more cargo.

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

Invite all travellers to bring their own coffee cup.

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

Members to chose their preferred seat in their profile and automatically be assigned this seat if available on their flight