This information is only from a SWA call agent, so who knows...But I called to see if my wife's Companion Status could be used on Airtran. Short answer NO. However, she said not yet, but soon there would be no more Airtran. They are going to be absorbing them, not running them as a separate airline. I don't know how much validity to put in her answer, but I'd sure hope she is right.