Award additional EuroBonus bonus and/or level points when renting an electric vehicle through a car rental partner such as Hertz, Avis or Sixt.

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

Do not carry tax-free goods on flights. Use as online service and if necessary in partnership with partners allowing pick-up at airports.

Require everyone to pre-order meals, snacks and drinks so that the plane can carry just the right amount of food and drinks.

Develop solar-powered aircraft with energy storage systems to enable fully renewable, zero-emission long-haul flights within the next decade.

I would use my skills in optimization and deep learning to learn what frequenzies and time schedules that maximizes the load factor of each aircraft in the fleet.