Transportation safety investigators held hearings this week into an accident that involved a major airline.
交通安全调查员本周针对主要航空公司发生的航空事故召开听证会。
Investigators of the National Transportation Safety Board were at the accident scene, Wallers said.
Wallers还说，国家运输安全局的调查员正在事故现场做进一步调查。
Investigators of the National Transportation Safety Board were at the accident scene, Wallers said.
Wallers还说，国家运输安全局的调查员正在事故现场做进一步调查。
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