I would like to see when booking every flights average flight booking. I prefer to support and book flights that are as fully booked as possible to minimize my footprint.

Include BIO-tickets in Friends & Family campaigns.

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

Turn old blankets, uniforms, seat covers into bags, carpets, pillow cases, etc. Upcycle old materials into unique collectibles to sell in the EuroBonus shop.

Using hydrogen tanks in the rear of the plane, for example. This could work on shorter routes such as domestic flights or intra-Europe.

Use powder soap instead of liquid soap in all lavatories, powder soap is much lighter thus reducing wieght.