Boarding pass and driving license is enough for domestic travel. For international travel passport and boarding pass.
As long as you are native to america, you only need to passport to enter another country.
Suggest you have your boarding pass either printed or on your phone. The airport website states the following under the security screening info: Screening Passengers must obtain boarding passes prior to entering the security checkpoint. Boarding passes and photo ID should be ready for inspection at the security checkpoint. The Transportation Security Administration (TSA) encourages travelers to arrive at the airport two hours prior to flight departure for domestic travel and three hours for international travel.
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