A handful of container lines have prepared shippers for the reality of the cost impacts of a potential strike by U.S. East and Gulf coast longshoremen at the end of September by saying they will slap a major surcharge on shipments to and from U.S. ports from Oct. 1. American Shipper has reported on a couple of those proposed surcharges over the last few days, but the list is larger than first reported. Maersk Line, Hyundai Merchant Marine, Yang Ming, and Hanjin Shipping have all a...