Passenger gives terrifying account of man's violent outburst on plane

Update: Phone video of man going crazy on flight to Boston

A passenger aboard a United Airlines flight from Los Angeles to Boston is praising the flight crew and fellow passengers for stopping a man who allegedly tried to open an emergency exit door and stab a flight attendant in midair.Subscribe to WCVB on YouTube now for more: http://bit.ly/1e8lAMZGet more Boston news: http://www.wcvb.comLike us: https://www.facebook.com/wcvb5Follow us: https://twitter.com/WCVBInstagram: https://www.instagram.com/wcvb5/