It has begun. I'm trying to finally book my LONE4 and got the infamous 15012-118 error, which is probably because it's being ticketed by AA but the first flight is on CQ (from AMS), it's my only option.

I suppose there's no way around this and the only option is to call the RTW desk? Should I call AA or CX?
Am I supposed to pay a handling fee because of this?