The last time I flew home from Dallas, my aunt told me she wanted me to purchase the tickets for her and my g'mother to come down. When I got on the flight, it said any tickets purchased during this flight will get 5$ off. Well cell phones can't access airtran.com through the gogo internet service for free like a computer. So I got off the flight, called customer service, and they said they would credit me back the discount after I book online.
Got home, booked 4 flights using the little debbie code, then called and got the 5$ discount. Saved 60$ that way.
I've also noticed that their prices don't change much either, maybe 10 dollars one way or the other. I fly out to Dallas for about 74-84$ each way. Of course close to booking prices can be up a little bit. But with the majority of flights going in and out of atlanta, it's still easy to get a good fare.