Instead of serving main meals on the flight briefly after takeoff, service the meal in the boarding area. Save load, effort and waste.

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

Same amount of points earned from origin to destination regardless of amount of flights.

If you reduce the allowed weight for luggage from 23 kg to 15 kg or so, people might start to think if they really need all that stuff with them.

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

Allow lounge guests to opt-out of onboard service and bring their meal and drink to the aircraft