Roger on UAL.
I’m surprised the list doesn’t include the entirety of ATT - I’ve never in my life seen a company as hostile to new business as modern-day ATT. Decades ago, when they were the only game in town, they treated customers like crap, but now that they’ve got competition, they’re even worse.
If you talk to people who work for the company, it's a complete paradigm shift. Consider, most companies strive to offer the best service for the price - that is the traditional method of customer service.
AT&T cuts service and coverage, until they lose customes - then, and only then, do they strive to improve service and customers. AT&T's business model is to provide the worst level of support and customers will tolerate - before they are willing to break a contact and engage in the hassle of moving their business elsewhere. Really, that's how they think.