I traveled today for the first time bringing a pistol with me. I took some tips from this and it went pretty smooth. I took my G19 apart and put it in the lock box. Neither the ticket agent or TSA asked me to open the box. I think the ticket agent did something wrong though as after I went through security and got to my gate the gate agent called me up to confirm I was traveling with a weapon on me. I let them know that was not the case and they said oh.... We will let the captain know. I guess I was an honorary federal LEO for about an hour.
I expected the issue to come back up on my connection but they didn't say anything.