Investigators from the NTSB and Boeing were expected to join the investigation into South Korea's deadliest air crash.

A deadly plane crash Sunday killed nearly 179 people in South Korea, an enormous tragedy that led to a week-long period of mourning being declared in the country. As the victims and their families deal with the aftermath,

On Dec. 29, all passengers aboard a flight on South Korean carrier Jeju Air were killed when a plane skidded down a runway and burst into flames. The incident happened at Muan International Airport (MWX) in the country's southernmost region.