SEOUL, South Korea — A passenger plane skidded off a runway at a South Korean airport Sunday, slammed into a concrete fence and burst into flames after its front landing gear apparently failed to deploy. All but two of the 181 people on board died in one of the country’s worst aviation disasters.

The Jeju Air plane crashed while landing in the town of Muan, about 180 miles south of Seoul. The Transport Ministry said the plane was a 15-year-old Boeing 737-800 jet that had arrived from Bangkok and that the crash happened at 9:03 a.m.