I take your point. But your original point was being surprised about the popularity of TPE to Los Angeles & San Francisco. My point is that the immigrant diaspora links (large number of Taiwanese in West Coast - at least in CA) explains the popularity of those routes so there is no surprise. I don't have the statistics of Taiwanese in Seattle/WA state so won't argue there. I agree that with TPE - SEA, immigration diaspora links probably doesn't account for all the airlines plying that route.