Originally Posted by BlondeBomber

Best segment runs used to be YYJ-YVR given frequency and short duration of flights. Quick turnaround (just wait at the same gate for the same plane), no border issues. Been a while since I used those. Nowadays it might be much more difficult with many full flights unless you can find days in your budget range with more classes available/sale fares (but then full flights is an issue on many runs).