I have a CX ticket booked in H and i'm AAdvantage Plat. I flew from LAX-HKG-PEK a month ago. I now need to return to Los Angeles but instead of leaving from Beijing i will be leaving from Shanghai. Since CX does not fly from Shanghai I have booked a ticket with China Eastern. The customer service lady at CX told me that she needs to have permission from her office in America to allow me to return home with only flying on the HKG-LAX segment. If not she said I would need to return using the original route (PEK-HKG-LAX) for the ticket to be good.

Does anyone know what the exact policy is? What should I expect when the CX agent calls me with a decision? Any information is greatly appreciated.