Why not rather do something to make trains more affordable? People need and want to travel, making air travel more expensive will just cause people to get stuck at home.

It's especially odd since trains inside countries tends to be affordable (and subsidised), but internationally it can get super expensive very quickly.

While those same tracks are used for cargo, so it's not like the whole European track network needs to be maintained just for a few passenger trains.

Kerosene should be taxed by an EU-wide tax.

Yes, or price carbon according to scientific recommendations, and remove exceptions like for Kerosene.