If your connecting flight is changed or canceled, the first thing you should do is check your airline's mobile app. In 2026, most major carriers (like Delta, United, or Lufthansa) will automatically "re-protect" you on the next available flight and send a push notification with your new boarding pass. If the new flight doesn't work for you, do not immediately join the long customer service line at the airport; instead, use the "Live Chat" or "Rebooking" tool in the app, or call the airline's international service number, which often has shorter wait times. If the change results in an "overnight" delay and the airline was at fault (e.g., mechanical issue), they are generally required to provide a hotel voucher and meal credits. If you are in the European Union or flying on an EU carrier, you may also be entitled to significant financial compensation under EU261/2004 regulations. Always ensure you have "Travel Insurance" that covers "Trip Interruption," as this can reimburse you for "missed" non-refundable hotel nights or tours at your final destination that the airline is not responsible for.