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Analysts say 74% of reefer cargo moves in containers.
ILWU says it may take between eight to 10 days to unload a ship because of limits on longshore hiring.
Business groups tell Obama that the use of a mediator is imperative in longshore union talks.
Top executives described initiatives to improve flow of cargo off docks at the nation's two largest ports during the TPM conference in Long Beach.
Vote ended a two-month skirmish over Obama immigration policy and spared agencies like CBP from cutbacks.
Environmental advantages of liquid natural gas remain undisputed despite a lack of profitability, according to the commission.