As a child, I traveled a lot (international) with my parents. I had a log book (available for children from many airlines) that was signed by the Captain or Fir

As a child, I traveled a lot (international) with my parents. I had a log book (available for children from many airlines) that was signed by the Captain or First Officer on the flight deck of each flight. I don't recall a visit to the flight deck ever being refused, except on an extremely short flight. The world has changed much since those days, generally not for the better.