The Jeju Air crash has raised concerns about the design of a South Korean airport and whether a concrete-reinforced mound beyond the runway played a significant role in one of the deadliest plane accidents in recent years.

A team of U.S. investigators including representatives from Boeing have examined the site of a plane crash that killed 179 people in South Korea.

Empty desks and a calendar marking days off after Christmas sit in a South Korean office where five co-workers once planned a holiday to Thailand which ended in tragedy on Sunday when their return Jeju Air flight crashed.

U.S. investigators could be seen Tuesday moving around the crash site in South Korea following the deadly crash of a Jeju Air Boeing 737-800.

By Joyce Lee SEOUL (Reuters) -Questions grew on Tuesday over the crash of a Jeju Air jetliner as police rushed to identify victims and as families of those killed in the deadliest plane crash on South Korean soil pressed authorities for more information.

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 stock price dropped more than 4% at the open of trading on Monday morning.

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.