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

Add green flights on some departures. nothing is served on these flights, only hand luggage is allowed, but you earn more Eurobonus points if you choose such a departure.

Issue extra bonus and level points to passengers who decide opt out of their included meal ahead of a flight.

Build in feature with EB for status ladder climbed by paying for sustainable fuel, checking in with light luggage, opting for climate neuatral meals and EV taxi to plane

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

Flying less emits less CO2. Thereby minimizing the impact on the planet.