How about YVR-BNE? It's weather at the other end that's important, as there are no deicing issues at SYD, BNE or HKG for example. WS has to deal with flights that have weather issues at both ends. There are much greater chances for delay with a flight that has deicing or snow bound airports at both ends, than just one. Plus long flights have greater opportunity to make up time enroute, rather than a short flight like YXE-YYC. The odd are stacked in AC's favour to have better OTP compared to WS, yet they are 16% lower than WS.