South Korea will remove a concrete structure at the runway of one of its southern airports, the scene of a plane crash that killed all but two of the 181 people on board last month

The Boeing 737-800 skidded off a runway in the South Korean city of Muan on Dec. 29 after its landing gear failed to deploy, slamming into the concrete structure and bursting into flames, killing all but two of the 181 people on board.

Son Chang-wan was in office while works were undertaken at Muan International Airport. Last month, a plane crashed into a concrete barrier there, killing 179 people.

South Korea has extended the closure of the airport where a Jeju Air plane crashed last month until 19 January. A Boeing 737-800 ran off the runway and burst into flames after ramming an embankment at the Muan airport, killing all but two of the 181 people on board.

Following the deadly Jeju Air accident, the government ordered low cost carriers to reduce flight times, boost pilot training and expand maintenance crews.

The last four minutes of data before the disaster which killed 179 people are missing, transport authorities say.

The two black boxes on the Boeing jet involved in the worst aviation disaster on South Korean soil stopped recording about four minutes before the accident, the transport ministry said on Saturday. South Korean investigators previously said the flight data and cockpit voice recorders were key to finding out the cause of last month's crash that killed 179 people.

The deadliest plane crash in South Korea's history is triggering a change at the country's airports. The BBC reports the concrete barriers that contain navigation systems at seven airports will be altered in the wake of the crash,