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

The new details were part of thousands of documents -- including new video from the end of the runway showing the crash -- the National Transportation Safety Board released.

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

Friday was the final day of the National Transportation Safety Board's (NTSB) three-day hearing on the deadly plane crash at ...

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

Clark Allen, the former operations manager of the control tower at DCA, was asked Thursday about the training for the air ...

The National Transportation Safety Board will wrap up its public testimony about the fatal midair crash between an Army ...

Federal investigators opened a three-day inquiry Wednesday into the January plane crash that killed 67 people over Washington ...

The communications between pilots and air traffic control were laid out in a visual timeline in Day One of the NTSB ...

It's been six months since 67 people were killed in a midair collision over the Potomac River, and now lawmakers say they are ...

The National Transportation Safety Board began its three days of investigative hearings on Wednesday into January's midair ...

The NTSB previously said the FAA had failed to address 85 near-misses between airplanes and helicopters near DCA in the three years before the crash.