The investigation into the deadliest air disaster on the country's soil remains ongoing, focusing on the role of bird strike and involving an analysis of the engines and the "localizer" landing guidance structure.

Traces of bird strikes were found in the engines of the Jeju Air flight that crashed at Muan International Airport, killing all but two of the 181 passengers. The preliminary report identified remains of migratory ducks.

South Korea’s authorities investigating last month’s Jeju Air plane crash have submitted a preliminary accident report to the UN aviation agency and to the authorities of the United States, France and Thailand,