Originally Posted by thois

My routing is MPM-xDOH-ORD-MBJ-LAX-LIM-SCL-IPC-SCL-xJFK-HKG-KTM-KUL-ICN-HEL-xLHR-NBO.

I would liked to have routed the ticket from HEL to NBO via DOH, but the rules don't allow flights between Europe and Middle-East when the itinerary utilizes backtracking in Europe/Middle-East. So I needed to use BA flight LHR-NBO.

In addition, QR flight DOH-ORD have higher carrier imposed surcharges, but I can't had routed it from DOH to ORD via Europe, because I needed to use backtracking and I wan't stop at HEL later on the trip. Also it seems that stop at KUL causes higher taxes and surcharges than many other Asian cities.

I haven't tested pricing lot of IB flights, but at least all BA/IB flights that I tried pricing with have caused high YR/YQ surcharges.