No, a printed boarding pass is generally not required at most modern airports, but there are specific exceptions where having a paper backup is highly recommended. Most airlines today provide a digital QR code via their mobile app or email, which can be scanned at security checkpoints and the boarding gate. However, if you are traveling to certain international destinations, particularly in regions with less developed digital infrastructure, the local authorities or airlines may still mandate a physical document. Additionally, if your phone battery dies, the app glitches, or you lose internet connectivity, a paper pass is a vital failsafe. Some low-cost carriers (like Spirit or Ryanair) may also charge a significant "reissue fee" at the airport if you arrive without a boarding pass and require an agent to print one for you. For the smoothest experience, save your digital pass to your "Apple Wallet" or "Google Pay," but consider printing a paper copy if you are traveling internationally or through an unfamiliar airport.