Based on recent events, I'm sure this will be well received...
My biggest problem is it's so low. 1.5/3 Euro for EU/non-EU travel.
That is, of course, the intention here. But that's not a solution, its pretty regressive.
Every kg of CO2 you contribute to pushing out in the atmosphere is a little bit of freedom taken away from the generations coming after you that will have to deal with the consequences.
If airplane flights are inappropriately priced compared to the externalities they cause - which I’d argue is the case, as with any industry powered by fossil fuel - then taxes are a great way to deal with that.
What alternate solutions do you propose?
Assuming you have a $150 ticket, this would be 1% of the cost, and seems unlikely to change behavior.
If people want to travel, the continent's already covered with roads and rail.
Generations from now, people will, if there are any left, look back on these bourgeois luxuries as a kind of grotesque oppulance, utterly out of whack with ecological reality.
Keep in mind that, AFAIK, traveling by plane is significantly more mainstream in the USA (probably due to the huge distances and lack of viable alternatives) than it is in Europe and specifically in France.
The protest that originated "gilets jaunes" was because the increase in gasoline price would affect low wage workers for which their car was one of the main tools for their job.
I cannot imagine many low wage workers that depend on international flights to take home some bread...
I find it hard to compare with a tax that will mostly affect people flying abroad for tourism and expenses-paid business travelers.