Find ways to allow tax-free purchases to be done in departing airport and to be picked up at the airport were I land. It could save a lot of weigh/fuel.

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.

Cut the knives and fork in the breakfast box, we only need spoon for yoghurt. There's no need for one glass per item

Send electronic ticket together with general flight information when sending e-mails to customers. This will cut the sent e-mail number and reduse server energy usage.

When the crew collects trash before landing, why not make separate rounds for collecting, cans, plastic cups, paper, etc instead of collecting all trash in the same bin.

On your flights, start sharing how much of that flight is powered by biofuel purchased by customers flying.