For domestic flights, you will need your Boarding Pass, any government, or a state-issued photo ID such as a driver's license or passport along with a copy of your itinerary/trip details.
Please note that a valid passport is required for all air travel outside of the United States. In addition to a passport, many countries require a visa for entry. Please click here to obtain the most current entry requirements for your upcoming trip or apply for a visa or a passport.