If you are NOT a US Citizen, you'll need a passport. If you ARE a US Citizen, you will not if you're traveling within the US.
Not within the boundaries of the United States boarders. International flights you will need a passport. Although, it wouldn't hurt to have it as a form of identification
Only if you don't have any type of type with you. I usually show both my driver's license and passport.
Yes you do
Good answer Constance
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