Shares in Boeing Co (NYSE:BA, ETR:BCO) fell 4.5% pre-market on Monday after a crash in South Korea yesterday that involved one of its aircraft.
Authorities in the country are reportedly planning a separate check of all Boeing 737-800s, after 179 people died in the crash on Sunday.
The South Korean government said it would carry out the audit of all 101 of the aircraft in domestic operation, with US investigators, possibly including Boeing, joining the probe.
Investigators are said to be focused on a landing gear malfunction, among other issues, after video footage of the crash showed the plane skidding along the runway at Muan international airport after attempting to land.
Boeing has been dogged by various issues this year, after a door panel fell off one of its jets mid-flight in early January, with other concerns over quality issues of its aircraft having been raised since.
Earlier this month the company told airline customers to check flight deck switches following a mid-air dive by an LATAM Airlines-operated 787 Dreamliner.
Boeing is also still battling in the courts over crashes of its 737 MAX aircraft in 2018 and 2019, where earlier this month a US judge rejected a plea deal after the company agreed to plead guilty after the crashes were found to have been caused by issues with the aircraft's maneuvering software, inadequate pilot training and regulatory oversight failures, leading to 346 fatalities and a global grounding of the fleet.
Shares in the US company are set to open at $172.65, according to pre-market trades, having closed at $180.72 last week.