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 Reagan Washington National Airport in Washington, D.C. No one survived.

The U.S. Army helicopter that collided with an passenger jet near Washington, D.C., had an advanced surveillance system turned off.

The NTSB confirmed all major wreckage from the January 29 mid-air collision between an American Airlines flight and a Black Hawk helicopter near Washington, DC, has been recovered. The wreckage is being analyzed to determine the cause,

More than a week after the horrific helicopter-plane collision near Washington, salvage crews have recovered most of the wreckage.