Earlier quoted context omitted.
The joke is that airfare is way too cheap compared to the damage it causes - be it noise, exhaust gases or land usage for airport infrastructure. In addition jet fuel in Europe is tax-free which enables these ultra low prices.
Air travel is comparable in fuel usage to trains [1]. Which surprised me a bit, as I expected much better mileage for the air travel, thanks to the exceptionally low drag of the rarified air up there as compared to wheels on rails. However the railway ought to be more expensive overall due to the other costs: requires build-out and maintenance of extensive ground based network, including some prime real estate; requi…
"Trains in countries like Japan are predominantly electric and transport a much larger number of people per cabin than trains in the US. While it’s difficult to broadly compare trains between regions it’s safe to say that trains in European and Asian countries are far more fuel efficient than those in the US, making them a leading option for travel.
In most cases outside of the US, trains are probably at least as efficient as buses and are much more efficient than cars and planes."
Yours, Physics.