I think Chapter 7 for the remaining majors is unlikely. I think that they would most likely choose to be acquired or merge a la US/HP.

I think DL is the most likely to go Ch. 11. If UA isn't able to really make a profit in Ch. 11, I doubt DL is going to have any more luck than UA in or out of bankruptcy. That leaves the inevitable merge and see what happens.

There is always banter about CO and UA, but I think DL and UA make a better fit, b/c I'd hate to see NonePass suceed MP.