During a layover, the destination of your checked luggage depends on whether you are traveling on a "through-ticket" or "self-transferring." If your flights were booked as a single journey under one confirmation number, your bags are typically tagged to your final destination and will be automatically transferred between planes by ground crews; you will not see them until you reach your final stop. However, a major exception exists for international-to-domestic transfers in countries like the United States: even if your bags are tagged through, you must collect them at your first port of entry to clear customs, then place them on a "re-check" belt immediately after. If you booked two separate tickets (self-transfer), your luggage will only go to the layover city; you must collect it at the carousel, exit the secure area, and check it in again with the next airline. To be certain, always check the "Final Destination" code on the white tag attached to your bag at initial check-in to see exactly where the airline is committed to sending it.