Several passenger plane crashes have occurred worldwide this year, including a Wednesday morning Azerbaijan Airlines wreck that has left dozens feared dead.

Investigators will try to determine what happened on the plane, including how its mechanical systems were functioning and what actions the pilots took.

The U.S. is sending investigators to South Korea to probe the deadly plane crash that killed 178 people as officials comb through over 600 body parts.

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.

Families wept and wailed as officials read off the names of the victims who died on Sunday, Dec. 29 at Muan International Airport, where the crash occurred, according to CNN and NBC News. Only two people, a pair of flight attendants, are said to have survived the crash, which was flying in from Bangkok, Thailand.

South Korea has vowed thorough investigations to find what caused a plane crash that killed 179 people, saying Monday that it will also inspect all Boeing 737-800 aircraft operated by the country’s airlines.

South Korea's acting president on Monday ordered an emergency inspection of the country's aviation system one day after a flight operated by Jeju Air crashed at Muan International Airport, killing 179 passengers.

South Korean acting President Choi Sang-mok ordered an emergency safety inspection of the country’s entire airline operation on Monday, a day after a fiery Jeju Air crash killed 179 people. Choi, who assumed temporary duties as president Friday,

Jeju Air Flight 7C2216 crashed in South Korea on Sunday, killing 179 people on board.

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

Shares of Boeing fell in early trading on Monday, one day after a Boeing model 737-800 was involved in the Jeju Air plane crash in South Korea that killed scores of passengers. The stock price dropped more than 4% at the open of trading on Monday morning.