The collision of a U.S. Army helicopter and an American Airlines plane over Washington D.C. has left many people stunned.

Get all the news you need in your inbox each morning. Federal aviation investigators vowed earlier in the day ...

An investigation is under way into the deadliest US air disaster since 2001, as authorities confirmed that there were no ...

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Authorities believe there are no survivors in the accident, which happened as a regional passenger jet was attempting to land ...

This data point is one of several key mysteries investigators are exploring as they seek to explain what caused the nation's ...