Associated Press/Lee Jung-hun, Yonhap – U.S. Air Force B-2 stealth bomber, left, flies over near Osan U.S. Air Base in Pyeongtaek, south of Seoul, South Korea, Thursday, March 28, 2013. A day after shutting down a key military hotline, Pyongyang instead used indirect communications with Seoul to allow South Koreans to cross the heavily armed border and work at a factory complex that is the last major symbol of inter-Korean cooperation. (AP Photo/Lee Jung-hun, Yonhap) KOREA OUT