Months before a chopper crashed in New York's East River, killing five people, pilots at Liberty Helicopters warned management of safety issues, an attorney representing several pilots in a lawsuit said.
원문출처 : https://www.cnn.com/2018/04/08/us/nyc-helicopter-crash-pilots-warnings/index.html
원문출처 : https://www.cnn.com/2018/04/08/us/nyc-helicopter-crash-pilots-warnings/index.html