Originally Posted by
jc94
In the situation you mention your baggage is going Intl to US via Canada, you won't see on a short layover it so won't know it's lost until you arrive in the US. If the flight is overbooked then firstly you are going high up the list after a connection, but then it falls to the airline as to their overbooking policies.
At T3 bags need to be picked up and re-checked-in at the transfer desk on an international-to-USA-via-Canada itinerary.
I understand T1 has another setup where bags don't need to be picked-up and dropped-off but I can't comment on it as I don't have any personal experience transiting at T1.