Experts ask why Black Hawk helicopter may have been flying above allowed altitude before crash
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.
What's So Special About The Black Hawk Helicopter?
The Black Hawk helicopter has been in service since 1979, but what makes it so special, that 36 countries use it? Here's everything you need to know.
NewsNation6h
What to know about the Black Hawk military helicopter
The Black Hawk helicopter was on an annual proficiency training flight when it collided with an American Airlines jet.
What to know about the deadly American Airlines and Black Hawk helicopter collision
An Army Black Hawk helicopter collided with a regional jet near Ronald Reagan Washington National Airport on Wednesday evening, U.S. officials confirmed to ABC News.