While I completely agree, it's almost a losing battle. People will pick it up without refrain. And when the company doesn't want to use the reserves to cover open time, they will simply jr assign and extend already exhausted line holders to the point of quitting. And if you can't do it, be prepared to meet with the chief pilot about it. Yes you can have a union rep with you if you so choose. In other words, don't make plans for your days off.