[rdtsc]

> But it also violates the airline’s fare rules, can get your travel agent in trouble and could lead to higher fares for everyone.

From a particular traveler point of view. Airlines are pretty few, and are consolidating, so in about 2 years you can find yourself banned from all 5-6 of them and have to take the train or drive. Has this ever happened I wonder? Can this happen? Airlines building private no-fly-lists and just refusing to do business with some people. Is that allowed legally.

Insurance companies do it:

https://www.privacyrights.org/fs/fs26-CLUE.htm

Why can't airlines? I imagine travelers who do it, would get pretty vocal online, so maybe some airline will respond publicly and say "we don't care, come to us?"...