In 2026, you generally do not have to print a boarding pass if you check in online, as most airlines have transitioned to digital-first systems. Upon checking in via an airline's mobile app or website, you will receive a mobile boarding pass featuring a QR code. This digital pass can be saved to your Apple Wallet or Google Pay for quick access. However, there are a few notable exceptions. Some international destinations still require a physical paper copy for local immigration or security protocols. Additionally, certain low-cost carriers (like Ryanair) may charge a significant fee if you arrive at the airport without either a mobile pass or a pre-printed paper one. If your phone has a cracked screen that prevents the scanner from reading the QR code, or if you are traveling from an airport with outdated technology, having a paper backup is a wise safety measure. Always check the specific "Baggage and Check-in" instructions in your confirmation email, as some "ultra-low-cost" airlines in Europe and Asia are stricter about this than major international carriers.