/u/graycat, although I’m unable to find any reference that the story is inaccurate from a quick HN and Google search. If you find it, feel free to reply with a link to correct me.
You may be interested in a previous discussion of Optimisation / Operations Research in the context of FedEx. graycat's comments were particularly interesting:
Mine (in this vein at least) was when someone posted an article about optimizing FedEx's location and then someone who was involved with it stepped in and gave the real story: https://news.ycombinator.com/item?id=9281466
I really enjoyed the comments in this thread from one of FedEx's first employees:
https://news.ycombinator.com/item?id=9281466