No, if your connecting flights are on a single ticket (PNC) with the same airline or partner airlines (like United and Lufthansa), you only need to check in once at your initial departure airport. At that time, the agent will typically give you boarding passes for all segments of your journey and your luggage will be "checked through" to your final destination. However, a high-value peer-to-peer essential for 2026: if you booked two separate tickets on different airlines (a "self-transfer"), you must check in for each flight individually. In this case, you will have to exit the secure area, collect your bags, and go through the check-in process again at the transit airport. For a seamless high-value experience, always check the "Boarding Pass" section of your airline's app; if you see two distinct QR codes, you are good to go. If not, a quick visit to the "Transfer Desk" at the connecting airport is a peer-recommended "win" to ensure your seat is secured before you head to the gate.