Sure Skunkworks, we wannabees can call it a flight deck visit, but then how wll we distinguish between flight deck visits ("Wow what a lot of switches! You sure have a good view. Where are we right now? Ooh, better get back to my seat, the movie is starting. Thank you Captain.") and what we call jumpseat rides, ("Excuse me Captain, I occupy the 'plankton' end of the aviation food chain. Could I please please ride in the jumpseat for this leg? I understand about sterile cockpits and I promise not to drool on the FMC.")
Maybe "flight deck visit" versus "flight deck hajj"?