AS is selling a SFO-YVR-ANC routing with a 46-minute connection in YVR. This is two different flight numbers, so presumably not the same plane, which means you clearly have to off-board.

Has anyone done such a routing, and if so, do you have to go through Canadian customs, then U.S. pre-clearance in YVR? Or is there a way to stay within the U.S. cleared area at YVR?

Thanks for the info.