On Wednesday morning, the NTSB released thousands of pages of evidence from the crash and the subsequent investigation -- including new video from the end of the runway showing the crash that killed 67 people.

Three days of investigative hearings on the deadly midair collision over Washington in January began Wednesday, aiming to reveal new insights into what caused the crash between a passenger plane and an Army helicopter that killed 67 people.

The first of the National Transportation Safety Board’s three days of investigative hearings is underway to help determine what caused the deadly midair collision on January 29 between an Army helicopter on a training mission and American Airlines flight 5342 landing at Ronald Reagan Washington National Airport.