What to know about the NTSB and the investigation into the DC plane crash
Since its creation in 1967, the agency reports it has investigated more than 153,000 aviation accidents and incidents.
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.
What we know after American Airlines plane crashes with Black Hawk helicopter in Washington, D.C.
Sixty passengers and four crew members from the plane and three Black Hawk helicopter personnel are feared dead as a recovery ...