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

The National Transportation Safety Board questioned witnesses Friday on collision avoidance technology and organizational ...

At their closest points, helicopters and planes routinely flew within 75 feet near the airport, according to the NTSB.

The Army helicopter that collided with a plane over D.C. in January had incorrect altitude readings, contributing to the ...

Board Chairwoman Jennifer Homendy has urged the Federal Aviation Administration to improve safety measures, pointing to ...

Investigators found the helicopter was flying higher than it should have been over the Potomac River in Washington. Its ...

The National Transportation Safety Board on Thursday questioned the failure of an air traffic controller to issue a warning ...

The National Transportation Safety Board, during hearings on Thursday, grilled officials from the Army, air traffic ...

The National Transportation Safety Board is launching a three-day investigation hearing on the D.C. plane crash that left 67 ...

The head of the National Transportation Safety Board criticized the Federal Aviation Administration for not “taking ownership” in the deadly collision. ABC’s Sam Sweeney reports the latest.

Investigators testifying at a hearing into the January's mid-air crash in DC suggest faulty altitude data may have led to a ...