During a standard layover (usually under 12–24 hours), your checked luggage is typically "checked through" to your final destination. Ground crews move your bags from the first aircraft to the second behind the scenes, and you do not need to collect them. However, there are critical exceptions: if you are entering the United States or Canada from an international location, you must almost always collect your bags at the first port of entry to clear Customs, even if your final destination is elsewhere in the country. You then drop them off at a "Connecting Flights" belt just outside the customs hall. For overnight stopovers, some airlines (like United or American) have time limits (e.g., 12–16 hours) beyond which they will not hold your bags; in these cases, you must collect them and re-check them the next morning. Always check the baggage tag printed at your origin station—it will list the final airport code where your bag is intended to be retrieved.