I will be beginning my rtw in YVR. However, later in my trip, i would be going from HKG-JFK. However, i would be interested in taking the HKG-YVR-JFK option. Is this permitted since i'm not actually transferring and it keeps the same flight number throughout the flight all the way to JFK. BTW, for the HKG-YVR-JFK flight, are pax allowed to get off the plane in YVR?