in Georgia, signage means nothing. that means that places can post all the signs they want, it does not mean jack. it has to be in the letter of the law. and you can carry a firearm into ANY airport up to the metal detectors.

you may also travel with your firearm, but you have to follow the airlines handling procedures on how to declare the weapon is for transit and present the correct forms that are easily obtained from the airliner's website that you are holding tickets to board.