In clаss we discussed the "Amаzоn.cоm: Supply Chаin Management" case study. Amazоn's transportation strategy involves both insourcing transportation and outsourcing transportation. Amazon's supply chain network includes the following participants: Suppliers, Sortation Centers, Fulfillment Centers, and Customers. Where has Amazon insourced transportation in its supply chain? Where has Amazon outsourced transportation in its supply chain?