Add green flights on some departures. nothing is served on these flights, only hand luggage is allowed, but you earn more Eurobonus points if you choose such a departure.

Establish additional partnerships with other airlines on specific routes to, for example, consolidate two half-full flights into one fully-booked flight.

a better airline trolley for sorting garbage. Maybe with possibility for travellers to put in from the sides.

Same amount of points earned from origin to destination regardless of amount of flights.

Find ways to allow tax-free purchases to be done in departing airport and to be picked up at the airport were I land. It could save a lot of weigh/fuel.

Encourage food suppliers and distributors to use more sustainable and healthy packaging in the food that gets served.