I believe we could have some flexability with the 'Rules'
A couple of years ago I had my father as a passenger and he would dearly have liked to join me in the flight deck. But like all he is considered a threat after 50 years in aviation, having being an engineer, training captain and finally chief of air accident investigation. Oh, not forgetting him having the Legion Merit of Honour presented for his work on 'hostilities by terrorists against civilian aircraft'. Can he please visit the flight deck..................sorry NO!