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Flexi-Van executive says "misplaced" chassis have aggravated congestion.
Move comes as ILWU, PMA talks enter 10th month.
Labor Secretary Thomas Perez met both parties accompanied by a mediator from the Federal Mediation and Conciliation Service who has been assisting in the talks since early January.
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.