I can confirm I had issues flying for about the first four years post 9-11. The first flight I took, there was kind of a panic and security showed up. Every time I flew, there was always some kind of issue and a call for assist, though each time it got less and less of a panic. One time the desk attendant lamented, “more and more of these every day”. I asked why this keeps happening. He said my name or ssn was close enough to someone on the govt watch list that I was effectively on the list.