Do not introduce Business class on intra-european flights. Plus is fair enough and very valuable for short flights and have a human price (like Norwegian and Ryanair).

Re-install the Gate Lounges where we can have coffee/snacks pre-flight

Introduce flying quotas, personal and for companies

Reduce taxi time,(for larger aircraft) continuous climb and decent, optimized flightpaths, implement greener lounges (green electric), more points for greener choices.

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

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