Common problems addressed by the customer care unit that answers calls to +1 (800)-370–8748 include Making a booking, Changing a flight, Canceling a flight, Flight delays, Baggage problems, and other customer service issues. Rather than trying to call Air China first, consider describing your issue first; from that, we may be able to recommend an optimal way to contact them via phone. https://sites.google.com/view/talk-a-live-person-air-china/home