Calling this "one of the worst deplaces of unruly behavior we've ever witnessed." >> this type of behavior has to stop, and the best deterrent is aggressive criminal prosecution. >> oh, lord! no! >> reporter: the assault marks the latest in a staggering year of airline passenger disruptions and violence. nearly 5,000 incidents reported. this woman now facing federal charges, filmed knocking out the teeth of a southwest flight attendant in may. she's pleaded not guilty. this year, the faa opening 923 investigations into unruly passengers, about three times the previous single-year record with t...