Originally Posted by
anabolism
In theory, any OneWorld airline can take over the ticket. In practice, some are much more willing to do so than others, and it certainly helps if they have flights in the ticket. AA RTW desk is quite good, but they won't touch an ex-CAI ticket that was issued after they pulled the fare. Other reports are that CX did a nice job in person at HKG, although it took quite a few hours (the poster had an 8-hour transit).
Just for everybody's information, Qatar stated that the 'original travel agent' needed to make any and all changes. This was about midnight at the transfer desk in Doha, so there may not have been the most experienced team on rotation at the time. There was nobody with any experience with oneworld fares around at the time, and I only had an 8 hour transit, so I flew the original itinerary.
The AA RTW desk took down my desired changes, but called back the next day to decline to take over the booking, as 'not enough had been paid for the ticket' (a pre-price rise ex-MPM fare). I gather this was in reference to the prices ex-MPM having risen since the purchase.
Qantas had originally issued my ticket, and after several false starts (hours on hold, disconnections, etc., I got through to an agent who was able to at least make the most pressing changes. I didn't get everything I was after, but time was short so I'll have to sort out the rest once I'm not in transit, and pay a second set of change fees.