It's legal at the regionals...whatever the union agreed to overrides normal labor laws. Exception is minimum wage...in most or all states, if your income divided by your duty hours (not counting regular reserve time spent at home) is less than minimum wage the company has to make up the difference. If you care, keep a spreadsheet of your duty hours vs. pay (I think it would need to be on a monthly basis) and after your first year you can then collect from the company. They won't just hand it over, you'll probably have to go to the state labor board to force the issue, but people do it. Unless you work at Lakes or the like, this would only realistically apply to first year pay.