Which airline are you flying? There are some that are more okay with basses than others. Southwest is one of the best airlines for checking basses. If you don't have a flight case, you can usually rent one from a shop or maybe someone will let you borrow their's. As long as the case with your bass in it is under 100 lbs., you should be fine. Southwest charges $50 each way to check a bass in a flight case. I have heard of some people that carry-on their bass and buy an extra seat for it. This can get expensive, and with all the BS surrounding TSA these days, they probably would either grope your bass inappropriately, thereby humiliating it, or not let it pass through security. Flying with a bass is definitely a hassle, but sometimes the perks are worth it (i.e. getting to cut in line, getting into conversations with interesting people that you might benefit from later, etc.) Good luck!