The union would have to give a 10-day notice before a strike can begin.

Got a confidential news tip? We want to hear from you. Sign up for free newsletters and get more CNBC delivered to your inbox Get this delivered to your inbox, and ...

What Are the Types of Health Insurance Plans? Health insurance companies offer multiple types of benefit designs, which affect where you can get care, how much you’ll pay and whether you need a ...

Les Masterson is a deputy editor and insurance analyst at Forbes Advisor. He has been a journalist, reporter, editor and content creator for more than 25 years. He has covered insurance for a decade, ...