Investigators so far have highlighted several factors that may have contributed to the collision, which left 67 people dead.

Incorrect altitude readings on the Army helicopter that collided with a passenger plane over Washington, D.C., in January ...

The NTSB continued its hearings Thursday into the deadly air collision between a military aircraft and a passenger jet.

Air traffic controller failed to notify commercial plane crew about approaching Army helicopter before Washington D.C.

The National Transportation Safety Board on Thursday questioned the failure of an air traffic controller to issue a warning about a potential collision in the moments before a crash between an Army ...