I'm sure this question has been discussed several times before but my searching skills are failing me at the moment so please forgive me for asking something that's already been answered:

My brother and his wife, who I've not seen in a year since they've been assigned to Korea, will be flying to the US with their new daughter (my niece) in January. They will have a 2.5 hour layover in Atlanta on their flight from ICN-MHT and I would really, really like to meet my niece.

Besides buying a refundable fare, is there any way I can get through security to meet them in between flights? This baby is wicked cute so I will do whatever it takes to finally meet her, but I'm looking for the easiest way.

Are there any problems that people have run into with buying refundable fares and returning them after checking in and passing through security?