Whether your bags transfer automatically depends on how you booked your travel and where you are transiting. If you booked your entire trip on a single ticket (one PNR) with a "through-check" agreement between airlines, your bags will typically go straight to your final destination on most international and domestic routes. However, there is a major exception: entering the United States. If you are flying from an international location and connecting to a domestic U.S. flight, you must pick up your bags at your "First Port of Entry," clear customs, and then place them on a "re-check" belt. Similarly, if you booked two separate tickets on different airlines, you must collect your luggage and check it in again at the second airline's desk. In 2026, some airports in the EU and Asia have introduced "Automated Baggage Transfer" systems that handle this even across separate tickets, but the general rule remains: always ask the check-in agent at your first airport to look at the "Bag Tag" and confirm the final airport code printed on it.