That depends on the BK court and the two parties. Scope will be THE last thing given up.

It only goes out the window if the pilots allow it to go out the window. That would take years to implement if pilots do not agree to it, even in Ch11.
Bankruptcy proceedings aren't a free-for-all candy store visit for the company. "We want to get rid of this, this and that". That's not how it works.

Not quite as easy after anymore for the company. But still possible depending on the court. Laws changed after Frank Lorenzo Continental Bankrupty.