Does anyone know if one can clear US customs in Puerto Vallarta before returning to the US or would I have to wait until I reach O'Hare airport for that? The reason I ask is that if I can't do it in Mexico, then I am pretty sure I would be going into the international terminal at O'Hare for this check and then I would have to go to another terminal for a continuation onto a domestic flight so I can reach my home airport. Would I have to schlep my bags from one terminal to another and re-enter through another security line in the other terminal? I have never had to do this before and would appreciate any advice/suggestions/etc. that you can give me. Thank you.