what about a possible "piece break up"?
Allegiant replaces mad dogs with some (but obviously not) all AirTran 717s...
other 717's bought by DeltaNort to replace DC-9s (longshot guess)
Alaska and SWA by 737s and expand ops

or...

AirTran just sells/trades 717's for EMB-190's or EMB 175's or CRJ-700/900s

who knows? I am just throwing stuff out here.....

i may have just given away great ideas and recieve nothing for it, if this happens the companies should send me a big check