In 2026, you do not have to print a boarding pass for the vast majority of domestic and international flights. Most airlines encourage the use of mobile boarding passes via their official apps or digital wallets (Apple/Google). You simply scan the QR code on your phone at security and the gate. However, there are three major exceptions: 1. Some airports in developing regions or specific countries (like Morocco or parts of Asia) still legally require a paper copy for stamp verification. 2. Some low-cost carriers (like Ryanair) may charge a steep "reissue fee" (up to £55) if you arrive without a pre-printed or digital pass. 3. If your phone battery dies or the app glitches, you could be delayed. To be "safe," it is highly recommended to take a screenshot of your mobile pass so it works offline, and many travelers still keep a single paper backup in their carry-on just in case.