Twaddle!
My daughter started flying by herself when she was seven years old. When she was 11 she flew to Europe by herself. These were visits to family members (grandparents, aunts). Probably until her teens she flew as an "unaccompanied minor," which means the airline was acting in loco parentis. They did look after her from all I could tell. Once a teen, she made these trips without bothering for special status. I'm not sure how airlines are much different from any other situation where a kid is separated from his/her parents. The confidence my daughter gained from these trips is unmeasurable. It was one of the things she wrote about on the only college application she ever made. (University of Virginia)
ML/NJ
Dumb question: Why didn't you fly with her?