Originally Posted by
YOWgary
It looks like it treats DPS as the point of turnaround, which only makes sense after you allow for the fact that the shortest possible *A routing YYC-DPS is probably YYC-YVR-HKG-SIN-DPS.
...but, technically, once you've done that, DAR is sorta kinda on the way home.
TO be clear, it is allowing SIN to be the point of turnaround. YYC-(ist stop) - DAR - SIN (turn) - YYC.
It is
not allowing DPS in place of SIN.