SEOUL, SOUTH KOREA — South Korean authorities say at least 179 people died when a passenger plane burst into flames Sunday after skidding off a runway and slamming into a concrete fence. Initial reports indicate the plane’s landing gear failed to deploy when the Jeju Air jet was landing in Muan, about 290 kilometers south of Seoul. The plane, carrying 181 people, was returning from Bangkok. It is one of the deadliest aviation disasters ever in South Korea. “Of the 179 dead, 65 have been identified,” South Korea’s fire agency said. A life jacket hangs on fencing next to the