During the hearings, the NTSB was told that the Army helicopter never heard the command from the air traffic controller to "pass behind the CRJ" as the transmission was stepped on. It was also revealed that the plane's pilots were not warned by the controller that there was a helicopter nearby or cleared to fly near the helicopter.

Federal safety leaders are uncovering new details about a tragic mid-air collision in Washington, D.C., that claimed 67 lives, with hearings revealing potential issues with helicopter altimeters.