Originally Posted by
Jasper2009
If the YYZ-ORD flight takes place within 24h after arriving at YYZ from LHR, you won´t be charged any additional upgrade credits.
That was te case in the old days of SWU's and SSWU's. I thought the connection on an international flight now has to be within 6 hours to be included in your international upgrade, but can't seem to find it on the AC site.