Just to confirm that Air China does NOT provide interlining when transiting in Shanghai. This should be clearly explained when one buys a Lufthansa ticket that includes an Air China flight, as I did. As present, there is no warning.
This is the reply I got from Air China:
Dear passenger,
Well note your email and hope this could find you well.
For the time being, we do not provide baggage check-in service for Air China + other airlines transiting in Shanghai.
Best regards,
(name of staff)
Service Agent
AIR CHINA EUROPEAN CALL CENTRE
Tel.: 800 86 100 999
(Available for calling from Europe only.
Email:[email protected]