Originally Posted by Himeno

There is no fee for changing carrier/date/time. It says so in the fare rules.

The airline is free to charge a service fee if they desire. Over the years of using oneworld tickets, I've made carrier/date/time changes with QF, JL, CX, AA and BA, I've never been charged for it. But then, the times I've made changes via a carrier reported to be charging service fees, I was changing either due to a situation with travel alerts and waivers out, or via the travel agent and I've told them when making the change that "this change is free as per fare rules".

Last month, I made changes to a DONE3 with CX in LHR and JL in SIN and a DAS13 with QF via travel agent. No fee.