What in the world? How is that comparison anywhere near remotely justifiable? Absolutely ridiculous.
> American Airlines Group Inc., in a letter to travel agents on its website, suggested it will have to raise fares if it keeps losing money from the practice.
Yes, please do. Price each ticket based on what it costs and a fair margin, not based on competitive meta-market games.
I can only assume that airlines are engaging in potentially unethical pricing themselves. For example, imagine if an airline delivers service from A->C and is low cost. A large competitor airline has no direct route, but flies A->B and B->C, and so offers A->B->C for the same price as the first airline. The route is actually below cost (or has a substantially smaller margin), but the airline offers it anyway to harm its competitor and to keep passengers within its brand. I don't know if I consider this unethical or not, but it's certainly no less ethical than customers taking advantage of hidden city routes for a lower price.