A three-day National Transportation Safety Board hearing on the deadliest U.S. aviation accident in decades dug into problems with altimeters, chopper routes and the busy Washington, D.C., airspace.

Aviation experts told the National Transportation Safety Board that night vision goggles may have created viewing difficulties for the pilots of a U.S. Army helicopter that collided with a passenger ...

According to the NTSB's investigation, the military helicopter had a faulty altimeter, which contributed to the collision with an American Airlines airplane.

Investigators probing the January midair collision of a passenger plane and an Army helicopter over Washington that killed 67 people found the chopper was flying higher than it should have been ...

Investigators probing the January midair collision of a passenger plane and an Army helicopter over Washington that killed 67 people found the chopper was flying higher than it should have been and… ...

The NTSB separately conducted tests on three other helicopters from the same unit, which revealed similar discrepancies. Scott Rosengren from the U.S. Army explained, "This is the expected errors ...

During the first day of National Transportation Safety Board hearings in Washington, investigators sought to uncover insights into what caused the January crash between the American Airlines plane ...

The details came out of the first day of National Transportation Safety Board hearings in Washington, where investigators aim to uncover insights into what caused the January collision that killed 67.

The January midair collision near Ronald Reagan Washington National Airport, which killed 67 people, is the topic of a three-day investigative hearing by the National Transportation Safety Board.

Investigators have found that a helicopter involved in a deadly crash with a passenger plane over Washington was flying above its height limit. The helicopter's altitude-measuring instrument was ...

Wednesday, the National Transportation Safety Board will begin a three-day investigative hearing on the Jan. 29 mid-air collision between an American Airlines regional jet and an Army helicopter th… ...