Normally it will need to be in a locked case.
I also locked the case to the bag. Mark the case with your cell number in case TSA wants to open it, otherwise they will destroy any locks or your case.
Guess I'm lucky, my property in Coweta county is surrounded on all sides by people that like to shoot. Heck my FFL lives two doors down. I always try to be respectful about when I do shoot. I don't shoot early or late.