There is something missing in this story. I don't get it.

According to this article, the airline became suspicious when they saw that the teenager was holding a driving licence from North Carolina!!!

Since when is it suspicious to fly to another state than the one where your driving license was issued?

The other thing is he went to the counter to get his boarding pass. He did not OLCI? Why?

Why didn't he OLCI, board the plane and leave at Charlotte?