When a flight is rebooked, the fate of your checked baggage depends on when the change occurs. If you are rebooked before your original flight departs (e.g., due to a delay or cancellation at the gate), the airline's ground crew is responsible for "pulling" your bag and redirecting it to your new flight. However, if the turnaround is very tight, your bag may not make the new flight and will instead arrive on the next available plane. If you have already reached a layover city and your connecting flight is changed, your bag usually stays in the "system" and is automatically tagged for your new flight. In 2026, the most effective way to track this is via the airline's mobile app, which provides real-time "Bag Scanned" notifications. A major "pro-tip" for modern travel is to place an Apple AirTag or similar tracker in your bag; this allows you to see if your luggage is actually on the plane with you or still sitting in the previous terminal, giving you a head start on filing a "Delayed Baggage" claim at the customer service desk.