Investigators work to determine cause in deadly midair collision

The National Transportation Safety Board has taken over the investigation into the deadliest aviation disaster in the U.S. in nearly 25-years. 67 people were killed in a midair collision between a passenger plane and an army helicopter. The NTSB says the cause of the collision is unclear. However, a preliminary report by the Federal Aviation Administration says air traffic control staffing at Reagan National Airport was not normal at the time of the crash. For more insight is Reyne O'Shaughnessy, who is a retired airline captain joined us on 'The Nine'.