Anyone with airTran contact?

I'm really interested in what they de-rate their B737 take-off and climb to. In the last week, I've been several airTran B737 take off's and they always seem to roll really long compared to the other airlines and the climbs are all slow and low. Of course, these have been at FLL/PBI only - can't say anything for any other fields they use, but the only thing I can think of as an explanation is a de-rated take-off and climb and I'd like to try their take-offs/climbs in Flight Sim.