Originally Posted by ATOBTTR

I thought some US airports (not all) were set-up so that if you were doing INT'L-US-INT'L, you did not have to claim bags in the US on arrival and then recheck for the onward int'l leg. The passenger still has to do immigration/passport check and technically go through customs with anything they were carrying but checked bag would not be sent to baggage claim, though in this scenario I would probably still wait at bag claim until the "Last Bag" notice to verify it didn't come out and was properly sent onward.