What if Parker divested the east operation (to include all former U assets and employees) to a seperate company, then merge the west into AA and let the former U (east) go into chapter 7 liquidation and then take part in the purchase of desirable assets from the wreckage of the former U ?

Perhaps some similar plan. He's got to be thinking of ways to save this company in any way he can and he knows as long as the U pilots hold the company hostage it's ultimately finished.

He's going to have to get aggressive about neutering this situation as this cannot continue much longer. He should admit defeat and error, carve the cancer from AWA and act as necessary to save what's left.