Allow users to visualise their travel carbon footprint in-app. Include everything such as transportation to/from the home and destination, hotels.

Getting more passengers on a bigger modern planes on certain routes will lower the emitted carbon dioxide per passenger as well as optimize the use of flight crews.

Option to buy train tickets and earn Eurobonus level points with the flight to reduce travel by car, taxi and promote sustainable options!

Use real cutlery as disposable cutlery is not sustainable, not even wood.

More variation in aircraft sizes = optimized cabin factor = less fuel consumption/passenger

In Plus and Business on long haul - hand out amenity kits by request instead of placing them on all seats.