here are over 400 million private firearms in the United States, 16 million people with permits to carry firearms, and 13 states where no permit is required to carry a concealed weapon. That less than 4,000 forgot a firearm in their carry-on is amazingly low.
That is one for every 200,000 passengers.
Just a little over 1/3 or 34.8% of the firearms had a round in the chamber. They could not have been accidentally discharged in the luggage.
TSA says 84% were "loaded", so 50% must have had rounds in the magazine, but not in the chamber.
Most of the firearms found in carry-ons were brought without the intention of doing so. TSA gives this advice:
If you're grabbing a bag, suitcase, briefcase, jacket or other item you haven't used in a while, be sure to give it the onceover so you don't accidentally take something prohibited to the checkpoint.