A government-issued photo ID, such as a state-issued ID card, is sufficient for domestic air travel. In other words, using your passport as a government-issued photo ID is possible but not mandatory. Your state-issued driver's license, for instance, is sufficient to board your domestic flight.

In most countries, including the United States, you do not need a passport for domestic flights if you are a citizen. Instead, you must present a valid government-issued photo ID, such as a driver's license or a state ID card. In the U.S., starting May 7, 2025, your state-issued ID must be REAL ID-compliant to pass through TSA security checkpoints for domestic air travel. If your license is not a REAL ID, you would then need to use an alternative like a U.S. passport or passport card. For non-citizens, carrying a passport is often recommended or required to prove legal status. Always check the specific requirements of the airline and the national aviation authority of the country you are traveling within, as some regions have stricter identity verification protocols even for short-haul domestic hops.