I'm always worried about flying with my bass. I've only done it twice, and both times I just took a HSC. My bass seemed okay, but there were a couple of really deep scuff marks in the case. Which leads me to believe that the handlers aren't exactly that gentile. I've been considering purchasing that SKB double case where you can put your gig bag inside it. But money's tight right now. Will airlines let you "carry-on" your bass? Is there some sort of general rule?