In 2026, if your flights are booked on a single ticket (one PNR), you generally do not need to check in again for your connecting flight. When you check in at your first departure airport, the agent (or app) will typically issue all your boarding passes for the entire journey. Your checked luggage is also "tagged through" to your final destination, meaning you won't need to visit the baggage carousel at your transit stop. However, if you have booked separate tickets (self-transfer), you must exit the secure area, collect your bags, and check in at the counter for your next airline as if it were a brand-new trip. Even on a single ticket, certain countries (like the USA and China) require you to clear customs and "re-check" your bag at the first point of entry, though you usually don't need to "re-check in" for your seat. Always verify on your initial boarding pass or app; if it says "See Agent" for your second leg, you may need to visit a transfer desk to verify documents or collect a new pass.