Let me get this straight, Yvr to SFO is International and I always use the Maple Leaf Lounge in YVR, however when I have continued on to another destination in the USA let's say BOS that I could use the United lounge in SFO. I have always been under the impression that you must be departing on an International flight which SFO/BOS is not it is a domestic flight. Have I been wrong on this?