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 Korea will tear down concrete walls at several airports, including Muan International Airport, after the Jeju Air plane crash in December.

Acting President Choi Sang-mok orders an extensive probe into the crash and the country’s airline safety systems.