It was very interesting being invited to the flight deck to land at JFK in the early 90s. (I'd visited the flight deck & was discussing an M.Sc. thesis I was doing on using the two runways at Gatwick as close parralels, and was then invited back for the landing. There was s crosswing and it was rather eerie wondering if we would line up with the runways but, of course, we were fine.
(Many years ago my rather who used to be an RAF pilot was invited to stay on the flight deck for a landing into SIN, and I was really envious, not thinking I would ever get the chance - which of course I won't again.)
Two other thing springs to mind. We had a visit to East Midlands and the group of us were on a bus going down the taxiway directly behind a spitfire weaving from side to side because apparently the pilot couldn't see directly ahead whilsy taxiing. Also in the 90s I was able to organise a trip to Heathrow Airport airport where we travelled around the airport on a coach provided by the airport - part of local community outreach apparently. Not likely to happen now.