While there are no 'set in stone' routes, I think you will find that for the most part, the same resorts end up on the same buses...I have yet to stop at AKL when I am going to BW, or stop at BW if going to POR. Yes, the bus routes can change based on need, but the Epcot resorts tend to all go together, while AKL and POP end up together. In fact, when my dh and dd flew in to meet me at POP last May, the first stop was POP, then CSR, then AKL...just like my earlier experience. I don't think they deviate too much.