Investigators have yet to determine whether the crew of an Army helicopter was wearing the devices when the Black Hawk crashed into a civilian airliner last week.

Data from a cockpit voice recorder of the Black Hawk helicopter that collided with an airliner near Washington, D.C, last week suggests the crew was wearing night-vision goggles.

The pilots of the US Army helicopter that collided with an American Airlines Group Inc. regional jet near Washington last week were likely wearing night-vision goggles at the time of the accident. Preliminary information including the type of mission they were flying and crew communications indicates the pilots were using the device,