South Korea's top two shipping lines are likely to have suffered losses in the first quarter of the year, data showed on Thursday, fueling worries that their already shaky financial footing would further worsen this year. The first-quarter operating loss for the country's top shipper, Hanjin Shipping Co., was estimated at 34.9 billion won (US$32.9 million), according to the data compiled by financial service provider FnGuide.