Forgive me, I'm not sure that this topic belongs here, but I don't know where else. I will be traveling from ORD-ZRH-CPH-DEL. 1st leg is AA, 2nd is SR, 3rd is SK. Obviusly I will have to do customs in DEL, but will I also have to in ZRH, or CPH. I have only been to Europe once, but it seemed like flights within EU were treated like domestic flights in US. IF ZRH-CPH flight was in an unrestricted area, then wouldn't I have to go through immigration at ZRH in order to just prevent anyone from walking out of the airport. I talked to SR and they thought that I may have to do customs in CPH, but they didn't sound very sure. Since I am a US citizen it shouldn't be a problem anyway, but I was just curious. If it makes any difference, i am on 2 separate tickets, 1 to cph, the second from cph-del.