Sponsor projects that can help build renewable energy sources, like wind mills, solar panels. Additionaly work with selected airports on becoming carbon neutral

Make a “code-share” cooperation with train providers, to allow for booking a ticket from A to B with combined train-plane modality and same benefits as connecting flight

a better airline trolley for sorting garbage. Maybe with possibility for travellers to put in from the sides.

Let the customer choose different carbon off-sets upon purchase of tickets. It can also include options that boost great projects.

Give/sell digital bag tags to frequent flyers

Sell biofuel to companies in bulk to lower their CO2 emissions and fast track the green transition. This would simply corporate action and speed up climate transition.