@cbsnews: 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, killing all 67 people aboard both aircraft. Audio was played between control tower DCA-LC and Army helicopter PAT25 as the moment of crash nears. Newly released surveillance video with a clear view of the Black Hawk helicopter approaching the path of American Airlines flight 5342, followed by the midair impact, was shown. The American Airlines flight from Wichita, Kansas, collided with a Black Hawk helicopter while coming in for a landing at Ronald Reagan National Airport on Jan. 29. #news #ntsb #plane #travel #americanairlines #army #helicopter #dca #airport #washingtondc