NTSB to investigate Northwest Airlines flight 188

This week The National Transportation Safety Board will examine cockpit voice recordings and interview the pilots and crew of Northwest Airlines flight 188, which overshot Minneapolis airport and lost contact with air traffic controllers for over an hour last Thursday. The pilots said they were distracted by a heated conversation about airline policy. Officials will be investigating whether the pilots may have dozed off in the cockpit. We speak to Ben Berman, a commercial pilot and former chief of major investigations at the NTSB.