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

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.

The deadly midair collision between a US Army helicopter and a commercial passenger jet that killed 67 people in January may have been caused by faulty altitude readings aboard the military aircraft.