Let people on the plane as they are seated, start with A and F, then B and E, and then C and D at last.

Bio fuel / green fuel as default, and having to pay more as a passenger if you want to fly on fossil based airplane fuel.

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

In small airports, like Vigra, where there only 1 or 2 airplanes stand, have roofs like carports to prevent snow on plane. This will reduce amount of deicing fluid needed.

"Coffee deal" - Sell well designed coffee cups with free coffee for a year. Less waste and collectible item for pax!

More level points to trips that are more sustainable and have less legs and layovers to promote more direct travel.