Yes, I know it’s insane, but my cheap Taipei flight required me to return to Canada, so I flew to Vancouver and am taking the Amtrak train to Seattle in a few hours, after I visit with my friend Steve.
In short, my Toronto-Seattle one way flight, with a detour to Tapei, turned into:
YYZ-ORD-NRT-TPE followed by TPE-NRT-SFO-YVR-train_to_Seattle
Which also means I passed through US Customs & Immigration each way despite connecting through (unlike Japan where you could transfer through without immigration)