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Port of New York and New Jersey terminals have seen additional containers from "extra loaders."
Bad shipper experience could result in long-term cargo diversion, according to port economist John Martin.
The $461m purchase of Maher's Canadian terminal will allow the Dubai-owned port operator to increase its U.S. business.
A strike could come as soon as Monday, according to a statement from Teamster affiliate Justice for Port Truck Drivers.
Carriers should not be allowed to profit from congestion for which they are at least partially responsible, says agriculture group.
The 10-ship loop will call in South China, Vietnam, Colombo, New York, Savannah and Norfolk, and is designed to provide fast transit from Asia to New York.