Actually, you should have left it locked. If they want to check it, they are supposed to come get youIt was a breeze, she had me sign the orange tag, set the combination so they could check it and said she'd close/spin the number when TSA was done. She placed my baggage claim sticker on the back of my ticket, I thanked her for making this so easy and boarded my plane.
Firearms and Ammunition | Transportation Security Administration