South Korea plans to strengthen its oversight of low-cost carriers (LCCs) and impose strict penalties on airlines failing to meet enhanced operational safety standards, the government said Thursday, following last month's Jeju Air crash.

The missing data deepens the puzzle of what caused the deadly air disaster in Muan, South Korea, late last month.

The nation’s transport ministry reviewed structures near airport runways after the deadly crash of a Jeju Air flight late 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.

A former transport ministry accident investigator said the discovery suggests all power, including backup, may have been cut, which is rare.

Jeju Air flies its planes more than any other major airline in South Korea, data show. Read more at straitstimes.com.

The black boxes of the crashed Jeju Air plane stopped recording flight data four minutes before the aircraft crashed in the worst accident in South Korean aviation history, the Ministry of Transport reported on Saturday.

South Korea said it planned to improve the structures housing the antennas that guide landings at its airports this year after December's fatal crash of a Jeju Air plane, which skidded off the runway and burst into flames after hitting such a structure.

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 Korean authorities said on Wednesday they would change the concrete barriers used for navigation at some airports across the East Asian country after the Jeju Air crash that left 179 people dead.

SEOUL (Reuters) - South Korea's transport ministry said on Wednesday that it would remove the concrete embankment installed at Muan International Airport following last month's Jeju Air crash, its deadliest domestic air disaster.