You need a photo ID
Minors can travel alone, but you need to check with the airline since the policies vary between carrier's. You also might need to obtain an unaccompanied minor form. Parents or guardian's need to accompany the minor to airline gates. TSA will usually allow this, but double check protocol on the official TSA website.
No passports needed within the country.
From my knowledge you only need a passport to travel out of the country. Could be wrong
No, but you need to be accompanied by an adult
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