Couple of things I would like to mention: Lines could be extremely long since all US bound passengers queue in the same line. So, tell your parents to be on line at-least 3 hours prior to the flight time. There will be a small sheet of paper that they need to fill before going to the immigration booth. No, you don't need to claim the baggage. When they arrive in the US, they are treated as domestic passengers and can go directly to the baggage claim area. There will be no immigration check when they arrive in the US.