He left early from the hotel room, and has been checking in whenever it seems appropriate. So far, he's called from the Five Points MARTA station at 8:31am, and from ATL at 9:06am. He got his ticket printed yesterday, so he was able to go directly through security and to the gate. His flight isn't until noon, so he'll have plenty of time to hang out at the airport.
I wonder if he'll decide to pay for the wifi access? He's got a credit card, but he tends to be quite cautious about using it without specific authorization.