SEOUL: South Korean authorities said on Wednesday (Jan 22) they will change the concrete barriers used for navigation at some airports across the country after the Jeju Air crash that left 179 people dead. The Boeing 737-800 was flying from Thailand to Muan in the southwest on Dec 29 carrying 181 passengers and crew when it belly-landed at Muan airport and exploded in a fireball after slamming into a concrete barrier. It was the worst-ever aviation disaster on South Korean soil. South Korean