Why was there a wall near runway at S Korea plane crash airport? - BBC

1. Why was there a wall near runway at S Korea plane crash airport?  BBC
2. He Didn’t Know His Father Was on Doomed South Korean Flight Until it Crashed  The New York Times
3. Jetliner skids off runway and bursts into flames while landing in South Korea, killing 179  The Associated Press
4. ‘Mayday, Mayday’: The Final Six Minutes Before the Deadly South Korean Plane Crash  The Wall Street Journal