South Korea's transport ministry has extended by a week special inspections of all 101 of the Boeing 737-800 jets run by the country's airlines, as jet engine maker GE joined a probe into the deadliest 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.

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