Well, international doesnt necessarily mean good. It does tend to pay a bit more though. Some international stuff is really nice, while some of it is downright brutal.

At UPS the most junior aircraft are the 747-400 and MD-11 in ANC. But if they were moved to a lower 48 crew base they would be fairly senior.

In the 757/767 ONT base there is a mix of domestic and international flying. The international stuff in ONT goes very senior, mostly due to the fact that they tend to be high paying lines, usually involving only one commute a month if you live out of base.