I have a couple questions about how cargo companies such as UPS or fedex run things?

Are you able to hop on a jumpseat and fly for free with your company when you aren't working the same way you can on an airline?If so, Can you bring your family or any non-related guest?

How do the schedules work? I know at the beginning there are a lot of night hauls, but how many does on do you usually work until you have time off?