Originally Posted by
HOLYMOLEAIR
I have a LONE3 ticket, which I've already flown the first flight. For better accrual rate I've called the AA RTW desk (who issued the ticket in the first place) to change one of the flights from a prime flight on S7 to a codeshare on CX (same flight time and date). To my surprise the agent told me that I will have to pay additional fare surcharge collected by CX
AA is very fond of recalculating taxes and airline-imposed fees whenever making a voluntary change. Since this is an xONEx ticket, you might try asking a different OneWorld airline if they would take over the ticket and make the change. You could ask CX, for example. If they quote you an additional add/collect that's the same or more than what AA quoted you, just thank them and hang up.
It's also likely that the ticket would need to be re-issued which would trigger the change fee of $125.
The ticket would need to be reissued, but the $125 fee would not apply. That fee is for route changes. Certainly AA would not charge the $125 fee for making date/time/carrier changes only.