The preliminary report was released by the Aviation and Railway Accident Investigation Board on Monday in South Korea.

Authorities have suggested that migratory bird strikes were the cause of last month's deadly plane crash in South Korea, according to multiple reports.

A small American Airlines jet collided with a Sikorsky H-60 military helicopter on approach to Reagan Washington National Airport and crashed in to the Potomac River on Wednesday night.

Pilots’ actions after the bird strike are an early focus of the investigation, according to people familiar with the probe.

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Investigators found bird blood and feathers in both engines of the Jeju Air Boeing 737 that crashed in Seoul, killing 179 people.

Preliminary investigation into the Air Busan Airbus A321 fire at Gimhae has not found evidence of dangerous items brought on board the twinjet, and no immediate indication that the blaze was terrorism-related.

Bereaved family members of the Jeju Air plane crash honor the victims through a joint ancestral rite -- also known as charye -- at the memorial altar set up for the plane crash victims at Muan International Airport on Wednesday,

South Korean officials investigating the fatal Jeju Air crash have published a preliminary report of the accident.

The feathers and blood stains on both engines of the Jeju Air plane were from the Baikal teal, a type of migratory duck that files in large flocks, according to a preliminary investigation report published on Monday.

A midair collision near Reagan National Airport has raised questions about aviation safety protocols, following Donald Trump’s controversial hiring freeze on air traffic controllers just days prior.