South Korea will release by Monday a preliminary report on last month's Jeju Air plane crash that killed 179 people, the deadliest air disaster on the nation's soil, the transport ministry said on Saturday.

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 design of the airport might have exacerbated the accident.

South Korean officials have released a preliminary accident report on last month's deadly airplane crash, and it revealed that the final four minutes of the flight recordings are now missing.