Miyazaki Airport in southwestern Japan on Sunday resumed operations after determining that a magnetic reaction possibly indicating the presence of an unexploded World War II bomb around a taxiway was caused instead by a large amount of iron sand. Japan Airlines canceled some of its flights Saturday night ahead of work to excavate the taxiway early Sunday. A magnetic survey had appeared to find an object 1.6 meters below the ground near the location where a wartime bomb had exploded on Oct. 2. The transport ministry’s local office said Saturday it found the concerning reading after surveying th…