Watch Live: NTSB hearing on deadly midair collision between plane and helicopter in D.C.

Investigative hearings into the deadly midair collision between an American Airlines flight and a Black Hawk helicopter over Washington on January 29, which killed all 67 aboard, began Wednesday. The NTSB is examining FAA and Army actions leading to the crash and exploring broader safety concerns in Washington airspace, as new evidence reveals prior warnings about near misses and equipment failures.