What we we've discovered is this, while the routing seems really random, FedEx bases the routes for their packages on economics.   FedEx has approximately 25 "strategically placed" hubs that they use to process their SmartPost packages and any SmartPost package has to get routed through one of those hubs for processing...even if it means going the opposite direction of the final destination. It takes a little longer this way, but it also allows retailers to be able to offer free/reduced rate shipping as it keeps the cost low.

You wouldn't believe some of the routing that we've seen! 

Image result for fedex and USPS truck