> Airlines are forced to compete on price and have to publicly list prices

Which regulation requires airlines to do so? I was under the impression that airlines mainly make their inventory available via GDSes for historical reasons (for decades before direct online booking, airlines would sell most of their tickets through travel agents, which needed unified interfaces).

There are some low-cost airlines that don't embrace GDSes and force you to use their app as well (I've been bitten by that once when booking through a "non-cooperative OTA/reseller and not being able to access my boarding pass), and conversely, I think some train connections are selling tickets to travel agencies these days.

> If your airline is delayed and you miss a connection, you will get a hotel for the night. In a train, you can get that.

Sure? EU regulation 2021/782, article 20 would disagree: https://eur-lex.europa.eu/legal-content/EN/ALL/?uri=CELEX%3A...