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

Recycling the deiceing fluid.

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

Let's start by using SAF at least for domestic flights.

Voluntary fee of 5 cent/mile that goes to research and developement all electrical passenger airplanes. The aircompany gives another 5 cent per same miles.

Charging mobile phones or other equipment from sunlight in the sky. «Day flights are always sunny»