Originally Posted by
anabolism
I have a DONEx ticket issued by a TA on QR stock. The TA charges for making any changes, including date and time. Can I call QR to make date/time changes after taking the first flight?
Yes, you should be able to change the ticket directly with QR after first flight. Be aware of big difference in QR service fees depending to which country number you call to. Don't have personal experience about xONEx changes with QR.
In theory, any OW airline can make changes to the ticket after the first flight, but it might be hard to get them do it.