The National Transportation Safety Board wrapped up a three-day investigative hearing into the mid-air collision between a ...

The hearings revealed that the air traffic controller had been overwhelmed, the helicopter's altimeter was inaccurate and there had been previous concerns with the helicopter route.

The NTSB heard testimony from air traffic controllers, the Federal Aviation Administration and the Army about the mid-air collision of an Army helicopter and passenger plane.

A three-day National Transportation Safety Board hearing on the deadliest U.S. aviation accident in decades dug into problems ...