Abstract: Physical Internet (PI) dynamic principal interface node (PIN) port selection includes selecting a primary maritime port as a PIN in a routing of freight aboard a sea going vessel from an origin node to a destination node in a PI model and receiving a disruption event in the PI model indicating an inability of the vessel to berth at the primary maritime port. A cluster of alternative PINs is determined in connection with the destination node of the PI model and a routing score computed for each alternative PIN based upon a cost of routing the freight through each alternative PIN. Finally, a new routing is established in the PI model utilizing an optimal alternative PIN in lieu of the selected PIN based upon a corresponding routing score, and a message is transmitted to the vessel to divert to a secondary maritime port associated with the optimal alternative PIN.