I am planning to go to NRT for the marathon in February and would like to maximize my chances of upgrading to NRT (and back) with my 2 SSWU.
Should I go direct YYZ-NRT or YYZ-YVR-NRT?
What are people batting with SSWU to NRT in Feb?
I would expect February to be one of the easiest month to upgrade but since every market is different, what do I know?

Thanks