Sadly, aviation is often exempt from fuel taxes and even VAT. I don't know the situation in Sweden, it seems they started taxing aviation recently. I don't know how much though.
Importantly, petroleum taxes are usually leveraged on consumers e.g. diesel and gas prices in europe are mostly special taxes (+ VAT), train operators pay taxes on electricity (possibly diesel as well, not sure about that one) but kerosene (and possibly bunker fuel) is free of both VAT and petroleum-specific taxes. And that's despite planes generally producing more CO2/passenger/km than cars by a factor of 30~50%.