Boeing (BA) shares are falling 4% in premarket trading Monday after a 737-800 operated by South Korea's Jeju Air crashed, killing 179 people, in the latest accident involving one of the U.S. company's planes. 

According to The Wall Street Journal, the aircraft rammed into a concrete barrier and burst into flames as it tried to land Sunday in South Korea's Muan County. All but two of the 181 people on the flight—which had departed from Bangkok, Thailand—were killed.

Shares of Jeju Air, a budget carrier set up in 2005, closed nearly 9% lower at an all-time low in Seoul trading Monday. 

Crash Is Latest Problem for Boeing

Boeing has been battling a series of problems with the quality of its aircraft, most notably this year with the mid-air blowout of a door plug on an Alaska Airlines (ALK) flight in January. That led the Federal Aviation Administration (FAA) to ground expansion plans for the U.S. aviation giant's best-selling 737 MAX.  

The safety problems, as well as a strike at its West Coast plants that lasted nearly two months and ended in November, led to cost-cutting moves including thousands of layoffs. Boeing subsequently raised billions of dollars to shore up its finances and stem a cash drain.

"We are in contact with Jeju Air regarding flight 2216 and stand ready to support them," a Boeing spokesperson said in a statement to Investopedia. "We extend our deepest condolences to the families who lost loved ones, and our thoughts remain with the passengers and crew."

Boeing's shares are down 30% this year through Friday's close.