I have four sectors on CX flights, returns on LHR > HKG and HKG > DPS, booked in economy with a travel agent.

Just wondering, what options are usually offered for upgrading to business, if any? Do they ever offer cheaper 'special offer' upgrades through manage my booking (similar to BA), or at the airport? If not, is my only option to call - and if so; does this attract a pesky 'change fee'?

I also belive the all the 747 aircraft do not have a premium economy product at all?

Many thanks.