Korea Aerospace Industries Ltd. on Monday reported its second-quarter net profit of 55.4 billion won (US$40.1 million), up 459.6 percent from a year earlier.The company said in a regulatory filing that operating income for the April-June period rose 784.5 percent on-year to 74.3 billion won. Sales increased 21.6 percent to 891.8 billion won.The earnings exceeded market expectations. The average estimate of net profit by analysts stood at 41.6 billion won, according to a survey by Yonhap Infomax, the financial data firm of Yonhap News Agency.Source: Yonhap News Agency