Let the captain thank the x number of passenger on board that added bio-fuel on the ticket.

Implement biometric boarding and baggage tracking using facial recognition and RFID for faster boarding, reduced delays, and improved efficiency.

Taxiing from and to gates from runways should be more smooth and with less fuel - using for example AI

Use more big size bottles and not small cans/bottles

Show country of manufacture and carbon footprint for all products in the EuroBonus Shop

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