Originally Posted by
steveholt
Not sure that's it. When I start building the itinerary, the default for the first overwater segment is AMM-LHR-BOS on BA, which is priced on the bottom section as $6545. When I switch that to QR, the price jumps north of $10000, which would align with what you're saying.
If I continue on with that fare where the the first overwater section is DOH and switch the final leg from AKL-DOH on QR to AKL-MEL-SIN-DOH with AKL-MEL-SIN on QF and SIN-DOH on QR, though, the price drops back down to $7398 AUD.
While not the same, I experienced a dramatic price increase by adding a simple transit. On a DONE4, I originally had ... SYD-BLR-KUL-HKG-CDG ... Changing it to SYD-BLR-
xCMB-KUL-HKG-CDG caused the fare to go from AUD6554 to AUD7469.