Previously the world's dominant shipping lines divided into four main alliances 

M2 ,G6 , CKYHE & O3

Now the biggest change in history has seen them divide into just three alliances 

M2 - Maersk and MSC
The Alliance - Hapag , Yang Ming and the soon to be merged three Japan carriers NYK,Kline and MOL
The Ocean Alliance -CMA ,Cosco Evergreen and OOCL

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