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ILWU, PMA agree to transform arbitration system, labor secretary says.
Aldridge is recalled as key figure as liner companies transitioned to containerships.
Union disputes claims that West Coast container docks are too congested to unload ships at night.
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.