An incentive to make longer trips rather than shorter trips would make traveling with air more sustainable.

Change your business model to focus on sustainability footprints for your «procts», do an holistic approav from a systemic and life cycle approach, make it comparable

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

Create an ability to share a seat in your car with other passengers on the flight. It's better than everyone riding their car.

Introduce zero-waste snack box for kids, with healthy snacks packaged in compostable materials. Could include fresh fruit, reusable cutlery, and info about reducing waste

Do not introduce Business class on intra-european flights. Plus is fair enough and very valuable for short flights and have a human price (like Norwegian and Ryanair).