U.S.-flag containership operator Horizon Lines, Inc. has reported financial results for the fiscal first quarter ended March 25, 2012 and revealed that it will be drydocking three of its vessels in Asia. The decision has been taken against a backdrop of a continuing operating loss. Still, it is likely to be viewed with concern by U.S. shipbuilders who will undoubtedly closely monitor how much U.S. duty the Jones Act operator pays on the work involved.