What identification to bring on domestic flight?

If I am under 18 and am going on a domestic flight WITHOUT a parent, what identification do I have to bring, if any? I will be accompanied with seven

If I am under 18 and am going on a domestic flight WITHOUT a parent, what identification do I have to bring, if any?
I will be accompanied with seven other people, six of which are the same age as me (15-16) and one who is an adult but is not the parent of any of us.

or:If I am under 18 and am going on a domestic flight WITHOUT a parent, what identification do I have to bring, if any? I will be accompanied with seven other people, six of which are the same age as me (15-16) and one who is an adult but is not the parent of any of us.

or:Based on the stories I have heard, I would not fly anywhere for any reason. A hitch hiker is allowed more dignity.

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