Usually, they will time to time check if your that childs legal guardian.. Most of the time, its men they check.. Example: 35-50 dude traveling with 14 yr. old girl.. Who are you? Dad, Uncle, Grandpa, ect..
Generally none is needed unless it is an infant. I suggest you Google your question.
How to get to the airport
usually the tsa tells the minor name and age and if they are 15 and have a matched license with their boarding pass show it sometimes tsa still asks name and age due to under 18 happened to me once the other 2 times just scanned at the check point
Yes
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