The last major U.S. air accident occurred in 2009, when a Bombardier Dash-8 Q400 flown by regional carrier Colgan Air crashed on approach to Buffalo Niagara International Airport, killing 50 people.

美国上一次发生严重空难是在2009年，当时地区航空公司Colgan Air运营的一架庞巴迪(Bombardier) Dash-8 Q400在布法罗尼亚加拉国际机场(Buffalo Niagara International Airport)降落时坠毁，造成50人死亡。

At a news conference in Seoul midafternoon Sunday, Asiana President Yoon Young-doo and a group of executives bowed in apology. Mr. Yoon called the accident 'regretful.'

周日下午在首尔举行的资讯发布会上，韩亚航空总裁尹永斗(Yoon Young-doo)和高管们鞠躬道歉。尹永斗称这起事故“令人遗憾”。

The airline doesn't believe the accident was caused by an engine or mechanical problem, Mr. Yoon said, but added that all facts related to the investigation would be announced by the NTSB. Mr. Yoon also said the pilots on the flight were veterans with around 10,000 hours of flying time each.

尹永斗说，韩亚航空并不认为这次事故是由发动机或者机械问题造成的，但他还说，所有相关调查事实将由美国国家运输安全委员会来宣布。尹永斗说，机上的飞行员经验丰富，每个人的累计飞行时间都在10,000小时左右。

One issue likely to come under review by investigators is the overall experience and hand-flying skills of the pilots, who couldn't rely on all elements of an airport instrument-landing system as a backstop.

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