No, you cannot physically board an aircraft without a boarding pass, as it is the legal "ticket" that links your security-cleared identity to a specific seat on a specific flight. However, in 2026, you no longer need a physical paper boarding pass. Most travelers now use Mobile Boarding Passes stored in Apple Wallet, Google Wallet, or the airline's official app. Some advanced airports, including several hubs in the U.S., Europe, and Asia, have moved toward biometric boarding, where your face acts as your "pass" at the gate. Even in these "paperless" systems, you must still have completed the check-in process to have a digital record on file. If your phone dies or you lose your pass, you can always print a new one at a self-service kiosk or a check-in desk at the airport using your passport or confirmation code.