re: #294 danarchy

I am trying to understand how this works? Don’t you have to clear US customs on the other end before ever getting on an international flight? I didn’t think they would even let you boad a flight without a valid visa.(Or at least a passport for a country in the visa waiver program)

You do not have to clear US customs to get on a US-bound flight from another country. Customs is done when you are exiting the international terminal; if you are using a US airport as a connecting destination between two international flights, you actually never have to traverse US customs at all. As for letting you board a flight, that is entirely up to the security in the country of origin; US customs checks your passport or visa status on the way in, which is where the inadmissible immigrants would get nabbed.