How old does a child have to be to travel solo on a domestic flight?

Generally if a domestic partner is covered then the child of that partner can also be covered.

a victim of domestic violence is of "free will". A victim of child abuse is "owed"

His father left the family when Robinson was a child. His mother worked as a domestic in Pasadena, California.

A domestic child is a child under the age of 18 that works for little money, room and board. They move into their employers home to cook and clean.