DL/AK, DL/HA, DL/VA. I don't think a certain CEO wants to be trailing a couple of others. It could be all 3 of the above. Or, it could be none. AK is great where it is now with DL, but if someone tried to take away the LA/SEA feed, it might be a target. HA keeps expanding to Japan (Sendai announced today), and that may make it a valuable target. I know Dan says the Locals won't allow it, but you never know. Now that Inoywe is gone, it might be easier in DC. And VA could be cheap, Branson now is friendly with a certain management, it has same type planes, could needle UAL in SFO, and again would be cheap.
I can also see Frontier, JetBlue, Spirit, and VA doing combinations. I don't see SWA with anyone other than maybe Sun Country, just because they have the same planes and they could dig at DL more via the Humphries terminal at MSP.
All just a guess.
Bye Bye---General Lee