South Korea will extend runway safety areas and redesign infrastructure after the crash of a Jeju Air Co. flight last month that killed almost everyone on board, sparking criticism that the the design of the airport might have exacerbated the accident.

The government on Wednesday announced a comprehensive plan to address potential risks associated with emergency landings at airports across the country following last month's deadly Jeju Air accident.

South Korean authorities said on Wednesday 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. South Korean and US investigators are still probing the cause of the crash,

Investigators have confirmed the presence of bird feathers and blood in both engines of the Jeju Air jet that crashed last month in South Korea, killing 179 people, according to a source familiar with the ongoing probe.

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

The two flight recorders on board a South Korean airliner stopped working before the jet crashed during an emergency landing and subsequent crash that killed 179 of the 181 people on board, officials said Saturday.

The airport is the site of the Dec. 29 crash of the Jeju Air Boeing 737-800 jet that killed 179 passengers on board.

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.