Hundreds of families are in mourning after an American Airlines regional jet collided with a U.S. Army Black Hawk helicopter on Wednesday night, with both aircraft plunging into the Potomac River near Washington, D.C.'s Ronald Reagan Washington National Airport. No one survived.

Pieces of the downed Black Hawk helicopter were removed from the Potomac River on Thursday as the investigation into the cause of the crash continues. The Federal Aviation Administration has notified airlines that it is "about to announce a slightly lower rate for" Reagan airport.