I don't think 9E is going Ch7 and here's why:

Delta did not "give" Pinnacle millions in April. Delta is providing DIP financing to pcl which is designed to help pcl get through the bankruptcy process with sufficient cash on hand to pay for the airline’s daily operations.

Its not a gift if you expect something in return, in this case DAL will expect cheaper contracts and more favorable numbers on exit from 9E.

Take that one step further and you can see that once 9E exits with a cheap-o contract the cost pressure exerted on all other DCI carriers will be increased tremendously, and there you have the reason why 9E will emerge from bk intact.