turns out the KEY to getting in is if a person is flying in ENVOY Class so if the plane to YYZ has Envoy you can access either the Envoy Lounge if there is 1 or the reg Lounge. If that plane has FC and its not called Envoy then no access into the Clubs. this was if the passenger isnt a *G, if they are a*G then the rules governing *Gs applys
What if the plane has Envoy to Hawaii, will the passenger get access?
I know with CO that if you fly in BusinessFirst to Hawaii (i.e. EWR-HNL and IAH-HNL) you do get access, but if you fly in First (i.e. LAX-HNL, LAX-OGG, SNA-HNL, SNA-OGG) you don't.
Of course the former flights don't have comp upgrades while the latter do.