Originally Posted by
serfty
That is only true before departure on the first segment.
Any other oneworld carrier can make changes after departure.
However, I would advise to stick with the issuing carrier as much as possible. Doing this helps reduce errors.
Ant, many carriers charge handling fee for changing reservations of ticket not issued by them.
CX charges reservations change for non CX issued tickets.
BA is worse. It charges handling fee for reservation change of non-BA segments for BA issued xONEx.