For starters, it is offseason, so loads will lower so it won't be hard to impose a payload penalty. If AC
averages 150 passengers on the flight, and doesn't carry any cargo, it can obviously extend the range on those days on which the winds permit. On the days that it doesn't, a fuel stop in Anchorage is still preferable to either not operating the flight or routing it through Vancouver, which already has a daily Tokyo flight. AC
also pushes the limit of the 767 on Toronto-TLV
, and on occasion a fuel stop in Newfoundland is necessary on the westbound, but that's still preferable than making a connection in Europe. I'm sure that in AC
's thinking, it is better to offer the service, even with the odd fuel stop, than to either discontinue the route or to fly it with a half-full A340. That A340 can be put onto routes where it can deliver larger loads.