I jumpseat on AirTran several times a month (they have an open jumpseat policy) and have nothing but good things to say about them (and no, I don't work for them). Gate people are hospitable, the crews are nice, and the new 717's are sweet.
As for Jet Blue, it was my understanding (maybe wrong) that they are only paying interest on their airplanes with a lump sum due later. Y'all can go to
www.flightinfo.com for more details and/or questions.