Jeju Air: Bird feathers were found in the engine of a South Korean jet plane

Authorities previously said the flight data and cockpit voice recorders of the plane stopped recording about four minutes before the disaster.

Experts who flew the same plane involved in the crash also questioned the presence of concrete barriers along the runway – with some suggesting the death toll would have been lower had they not been there.

The concrete structure holds the navigation system that assists the aircraft landing, known as a localiser.

South Korea’s transportation ministry has said that this system can also be found at other airports in the country and even abroad.

Last week, the authorities announced that they will replace the concrete barriers used for navigation at seven airports around the country. Seven airports will also have runway security areas adapted following the review.

Preliminary reports have been submitted to the United Nations aviation body and to the authorities of the United States, France, and Thailand.