They missed a notable one...or word didn't get to the media. I'm not sure of the names or dates, but this happened in the last few years; I was told it by someone who certainly does know.
A plane was making a no-commercial-passenger flight trip to a major hub airport. In addition to the minimal crew, a couple other airline employees were hitching a ride. Such employees may do so, and without passing thru standard security checks. While approaching the destination, passenger X opened his duffle bag and retrieved a claw hammer and a diving spear gun (why this selection, and why he never used it, nobody knows). He proceeded to attack the pilots. One pilot had his skull pretty well bashed in, surviving but with substantial brain damage. X attempted to force the airplane into the airport terminal; the losses would have been enormous. Between the 2-3 others on board they managed, with injuries, to subdue X.
