Korean Air Lines Co. , South Korea's biggest carrier, said Wednesday it will conduct due diligence on Asiana Airlines Inc. until mid-March while drawing up an integration plan for the two airlines. Korean Air plans to raise 2.5 trillion won through rights offering early next year and spend 1.8 trillion won of the proceeds to acquire smaller local rival Asiana Airlines, South Korean News Agency (Yonhap) reported. "The company will ...