If you picking up a friend or relative that's just arrived, there shouldn't be any reason why you couldn't bring your gun if you have a conceal / carry permit. TSA wouldn't let you through security without a boarding pass anyway, so having a gun in the non secure area of an airport terminal shouldn't be a problem.

Now if you're boarding a flight and try to bring a gun through TSA screening, you'd better cancel your travel plans because the TSA & Airport Police are gonna want to have a little talk with you down at the police station.