I’ve certainly written the most about the mechanics slowdown component of this issue. It’s what employees and the company have been most vocal about. But even without that the operation would still be suffering. And the reason to get a joint contract done isn’t just to end the animosity (an odd place to be for a company claiming its culture is its competitive advantage), it will also reduce the friction in getting legitimate maintenance work accomplished — on ex-US Airways aircraft by legacy American Airlines employees and vice versa.
Even so, the airline will have to invest in clearing deferred maintenance items. It will have to stock the parts needed to keep the fleet flying. In the meantime they’re still planning to re-start their domestic narrowbody densification program next year, so they’ll be taking additional aircraft out of service. It may be awhile for the airline’s operation to recover even after they get a deal done with mechanics and there’s little indication at this point that a deal is close.