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Air transportation is the last mode to roll over advance manifest submission to Customs' Automated Commercial Environment system.
Such an alliance could have a "competitive edge," according to industry consultant Drewry.
A strike could come as soon as Monday, according to a statement from Teamster affiliate Justice for Port Truck Drivers.
Trade Promotion Authority, a bill that grants the president authority to conclude trade deals without congressional interference, moved forward in the Senate Thursday morning.
Three of the biggest U.S. retailers have said maintaining in-stock levels was a challenge in first quarter 2015 because of West Coast port disruption.
The Southern California port plans to acquire 3,000 container chassis in two steps.