Don't get excited yet...Bag Fees and Change fees at Air Tran are still here, but should be dropped fairly soon in early 2012 once SOC occurs (based on rumors).
However it has come to my attention scouring over Air Tran's website that WN has been realigning some of FL's Fee's to match Southwest's Fee's and Extra Charges and Policies.
Many of the fees at Air Tran will result in lower fees to match WN's policies, but some will also increase as well.
*Effective April 10, 2012, the pet fee will change to $75 each way per pet carrier. (Was $69)
Overweight Baggage Fee
*Effective April 10, 2012, items from 51 to 100 pounds will be accepted for a charge of $50 per item.
Standard Fee / weighing more than 50 lbs up to 70 lbs (Was $49)
Standard Fee / weighing more than 70 lbs up to 100 lbs (Was $79)
Just highlited the big changes I think will affect Customers at Air Tran...the rest are mentioned in the link and mostly affect Sporting Goods equipments, which mostly results in lower fees.
I believe the Carry On Pet Fee is the only one that increases.