Originally Posted by
Often1
No. You will need to pass Canadian Customs on arrival at YYZ from DFW and then US Customs at YYZ enroute to ORD. Other factors include not just same PNR, but whether you are on one ticket and if not on one ticket, what carrier(s).
Same PNR 3 tickets SAT-YYZ, YYZ-ORD, ORD-MSP all American except for ORD-MSP that is american eagle