Yes, airlines and security officials strictly check identification during the boarding process, though the method is evolving. For international flights, you must present your valid passport to the gate agent to ensure it matches your boarding pass and that you have the necessary legal entry requirements for your destination. For domestic flights, you typically show a government-issued photo ID (like a Real ID-compliant driver's license). In 2026, many major airports have transitioned to biometric boarding, where a high-speed facial recognition scanner verifies your identity against a digital manifest in seconds. Even with these "touchless" systems, you are legally required to have your physical ID on your person at all times during the boarding sequence.