thank you for the replies.
I'm looking at doing a B747-8 PEK-SHA flight before a long haul out of SHA ... but the Air China website doesn't seem to facilitate mixed cabin bookings ...
Is there a way to book mixed cabin on the CA website?
Or if I book an economy itinerary online - can I phone up CA and upgrade the B747-8 segment only?
I'm hoping to snag an upstairs seat on the B747-8 !