On arrival, those going on to YYZ were directed to a secured transit area until re-boarding was announced. There was no security check. Frequently, the equipment was downgauged from a 744 to DC10 on the YVR-YYZ segment. One would get 2 boarding passes at HKG or NRT. One for the segment to YVR and the second one for YVR-YYZ. There would also be other international connecting passengers. I had flown about half a dozen times in the 1990's before the demise of CP. It was necessary for CP as CX (ironically an Aeroplan partner airline) began flying non-stop HKG-YYZ with 744 and later A340 equipment. The westbound YYZ-HKG required a technical stop at ANC. (AC was still a student pilot learning how to fly across the Pacific.)