FlugzeugA
Like you I have had a few cockpit visits over the years, the best being a landing in Kai Tak the old Hong Kong airport in a CX 747. However I cannot think of any airline which would allow that now.
You maybe able to do it on a private jet if you are charting it, but I am not sure. It is a shame as I am sure a number of pilots got the flying bug from visits like that when they were younger. I can’t see it coming back in my life time either.
Cheers
Mr Mac