Present sustainability data for the flight in the infotainment system, with for instance bio-fuel stats, # meals pre-selected and how much carbon emissions was saved.

Use larger packages for the most consumed drinks, instead of handing out endless amounts of cans (less garbage, less weight on board) .

You could offer cheaper tickets during these hours, encouraging passengers to choose more eco-friendly flights based on fuel efficient routes, altitude and time slots.

Adjust flying height to reduce contrails

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

Offer pre-filled reusable water bottles and collect them in before landing