The helicopter involved in the fatal midair collision on Wednesday night may have flown off its approved path, The New York ...

This data point is one of several key mysteries investigators are exploring as they seek to explain what caused the nation's worst air disaster in more than a decade, aviation experts said.

A Washington, D.C., plane crash marks the country's first commercial flight fatality in 16 years, and it happened over the most secure airspace in the country.

There were a dozen fatal crashes during Army Black Hawk training missions since January 2014 that claimed the lives of 47 ...