South Korea's transport ministry has extended special inspections of all 101 of the Boeing 737-800 jets run by the country's airlines by a week, after the worst aviation disaster on the country's soil,

Boeing shares were lower Monday after South Korea announced it is launching an investigation following the deadly Jeju Air crash over the weekend that involved a Boeing jet.

South Korean officials are struggling to determine what caused a deadly plane crash that killed nearly 180 people on board, with the nation saddened, shocked and ashamed over the country’s worst aviation disaster in decades.

Accident investigators are trying to find the cause of a Jeju Air fatal crash landing that killed 179 of the 181 on board the flight.

On Sunday morning, the commercial plane skidded off the runway, crashed into a wall and burst into flames while landing at Muan International Airport – killing all but two of its 181 passengers.

After overcoming pariah status at the end of the last century, South Korea must learn what caused the catastrophe on Dec. 29 and what lessons to draw from it.

The cause of Sunday’s crash remains under investigation but aviation experts were quick to distinguish the incident from the company’s earlier safety problems.

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 slide came hours after South Korea's transportation ministry announced it would investigate the crash and conduct a full inspection of all Boeing 737-800 aircraft in use in South Korea.

South Korean investigators said Saturday they were close to finalizing the transcript of the cockpit voice recorder from a fatal plane crash that left 179 people dead last week. The recording may hold clues to the final moments of Jeju Air flight 2216,