Living in Spain, I love trains and take them over airplane when it's an option. However, trains are often around twice as expensive as flying for may routes. I know nothing about trains, but intuitively I would expect the opposite, and I really wish it was more affordable, specially high speed rail.
This is mentioned near the end of the article but the reason those short domestic flights are so cheap in Europe is that commercial kerosene is currently tax exempt in every single EU member state. Jet fuel is cheaper per gallon in the EU than it is in the USA! (or was, before the current war) In typically tax-happy Europe this always struck me as odd, agree it is sad when you find out an airplane ticket is cheaper t…
Domestic use is taxed, and at rather steep rates (look at the US!); however, because most flights in the EU are international, it would require both nations ok'ing a tax on flights between them. No one has gone through with this, and it's doubtful any one ever will, for a variety of reasons.