Well, you know, I remember watching a documentary (it may have been Lost Liners), where a maritime historian explained that we forget that the trans-Atlantic liners were not just for bringing loads of passengers from Europe to America. On the contrary, there were many of immagrants that would work in the United States for a while, make their "fortunes", then return to their home countries.

From what I have read, 1907 was the first million immagrant year for the United States. Maybe by the time Olympic came into service, some of those early immagrants were starting to trickle back to Europe and such?