Hi, am flying on one ticket, Perth to Syd via QF and then out to Vancouver via Air Canada, and then back on Air Canada from Anchorage to Vancouver and then to Sydney and trans to QF for domestic flight back to Perth. They are interline airlines. I am getting confused as to whether we can use the QF seamless transfer for either direction. Time is tight so would be a bonus if we could. Does just one flight qualify you or does it have to be both flights?