or what about going via YUL, you will get 2288 plus 572 COS bonus for 2800 miles each way, plus 500 or 250 for the YUL - YQB segment, so as long as it was a latitude fare the mileage would be 6600 miles, or on a fun fare 6100 miles, assuming you got the upgrade YVR - YUL both ways. This way on a latitude fare sounds safer to me as with the connection in YYZ you need a COS bonus on all segments, and it may not be convenient to swap to a 319 for the 2 and 3rd segments. have fun.