This is not true. There are good reasons to consider representation but this isn't one of them.

For one thing "at will employment" is only boilerplate in company documents to scare employees. There is no such thing in America today. You have to have good reason to terminate someone AND that reason must be consistent with past practice with other employees. The later is typically a very good protection (have you seen DD's late-model porsche?).

SKW has removed two high-profile CP's for pushing the "at-will" boundaries.

Secondly they will only fire you if you're a repeat problem child, or get caught lying. You can make all the honest mistakes you want, just don't lie. I know people who should have been fired and weren't. They could have fired me once or twice, but they didn't. I called the boss, fessed up, and that was the end of it. Not even a carpet dance.

Now they do fire probies for one big strike (ex. sitting SFO reserve at Lake Tahoe, etc). But that's just like anywhere else, union can't help that. Some probies need to get fired, and some millenials need to see that happen to drive the point home that airline scheduling does NOT revolve around their personal life. That phenomenon is not just at SKW, happens at legacies too.