Hundreds of families are in mourning after an American Airlines regional jet collided with a U.S. Army Black Hawk helicopter on Jan. 29, with both aircraft plunging into the Potomac River near Ronald ...

Officials from the NTSB and the FAA are expected to speak to lawmakers as the effort to pull wreckage from the cold waters of the Potomac River continues less than five miles away.

A timeline of the tragic collision between a commercial plane and a Black Hawk helicopter over the Potomac River, with insights into the ongoing investigation.