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PMA neither loaded nor unloaded ships over the weekend, leaving yard and gate operations up to individual terminals.
Draymen say they could be forced out of business by huge demurrage and detention bills.
Ports using contingency anchorages as number of ships waiting for berths grow.
Transpacific carriers cite port congestion and stronger demand as economy improves.
New style port directors are trying to tailor ports to industry supply chain needs.
Senate moves to decouple fight over immigration policy from Homeland Security, but resistance remains in House.