UPDATE 2-Delta invests in partner Korean Air, seeks to expand in Asia

Delta Air Lines Inc said on Thursday it has acquired a 4.3% stake in partner Korean Air Lines Co Ltd's parent company with a view to expanding across Asia.The No. 2 U.S. airline said it intends to increase its stake in Hanjin Kal Corp, which owns about 30 percent of Korean Air, to 10% over time, after receiving regulatory approval.Delta Chief Executive Officer Ed Bastian recently said he viewed the Korean Air and its Incheon International Airport hub in Seoul as a gateway to adding more destinat