If we're gonna slash subsidies and introduce carbon tax on flights, it needs to hit corporate and expensive tickets as hard as possible whilst sheltering cheaper tickets as much as possible.
There's so many things HN proposes should be taxed / excised extra: cars, flights, gas, soda, alcohol, meat, rare metals in devices, batteries, electricity consumption etc etc.
They aren't bad ideas (hell, I agree fully with the sentiment of most of said ideas) but it's so easy to be blind to the fact that you'd basically be turning daily life into a two caste system where only the rich are allowed vices.