do you remember the Russian Airbus who's captains son was allowed to take his fathers seat ...... don't remember the exact circumstances but the aircraft was sent into a non-recoverable dive as a result of the boys actions ...... total write-off with all on board lost ....... I must say that I would prefer cockpit access to be restricted to flying staff (on and off duty) and of course ATCO's for Familiarization trips, with prior formal permission ......