AirTran Airways is unsafe and should never be flown.
You might want to add to your list that AirTran has a fatal crash rate over 10 times that of any major carrier.
AirTran/ValuJet has a corporate culture of saving money at the expense of safety or lackadaisical maintenance. They use ancient aircraft with parts that are salvaged from third world airlines.
The 1995 crash
The 1996 crash
The 1998 crash