What is a Black Hawk, the helicopter involved in the deadly American Airlines crash?
The Black Hawk is a US Army workhorse helicopter. It has been flying for decades. One tragically collided with a passenger jet this week.
What we know so far about the American Airlines-Black Hawk helicopter crash
A search and rescue mission is underway in the Potomac River after a military helicopter collided with an American Airlines regional aircraft near Washington, D.C.