Originally Posted by
yyz_atc_qq
I'm not 100% in agreement. 99.99% yes, but there is one other VERY VERY remote possibility. The BMW service that no one really knows truly how people are selected. There is a slight chance that if you were selected for the service they could take you to T3, the only thing is that in the case of the OP, how would AC know in advance that you were connecting to a different airline. Normally (haven't heard of any examples otherwise) the car service is for domestic-international connections within T1.
Although nothing is public, the service selection includes full knowledge of the itinerary and would only pick up someone connecting to an international (AC) flight in T1. It is not a lottery where passengers are selected from a random draw and greeted with a limo asking them where they might want to be driven. Nice thought but I think we can firmly round that 99.99 to 100%.