Boeing Co

South Korean officials said Monday they will conduct safety inspections of all Boeing 737-800 aircraft operated by the country’s airlines, as they struggle to determine what caused a plane crash that killed 179 people a day earlier.

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.

The plane operated, by South Korean budget airline Jeju Air, skidded off a runway at Muan International Airport Sunday before slamming into a concrete fence and bursting into a fireball.

A federal judge rejected Boeing’s deal with the Justice Department to plead guilty to a criminal fraud charge tied to fatal crashes of 737 Max planes.

Boeing machinists walked off the job on Sept. 13 after overwhelmingly rejecting an earlier proposal.

Boeing said it will lay off about 10% of its workforce as losses deepen from an ongoing factory strike.