Present sustainability data for the flight in the infotainment system, with for instance bio-fuel stats, # meals pre-selected and how much carbon emissions was saved.

Replacing the paper catalog with a QR code sticker. This saves tons of paper. Many catalogs are destroyed or unread.

For flights with a lot of empty seats, open more award seats short time before departure.

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

Collect food waste separately, return as food for the animal farms supplying the meals, creating a true circular supply chain.

Include meal information as early as possible in-app.
This is good for people with allergies, so they abstain from it.