I get a weekly feed from TSA on how they are doing and what trends they are seeing in security. It is pretty much self serving but there is always this listing of the number of firearms they are finding in carry on and inproperly stored in checked baggage beyond the silly stuff people shouldn't carry around through the airports. Here is the current report - https://www.tsa.gov/blog/2018/12/04/...november-19-30
Note the number . I personally find it hard to believe that that many people are forgetful enough to try to walk through with a firearm (let alone with a chambered round) . So these must be mostly quality control testing by air marshals or TSA agents. Taken at just face value by someone less questioning it must be terrifying to them..... And what heros the TSA are for their safety.
And they make me take out my silly little travel CPAP machine every time I fly.
jim