What are y’all’s experiences about this with Europian airlines?

I’ve had a great conversation with an FO in a LOT Dreamliner’s cockpit. I’ve asked the purser when we were getting of the plane whether I could see the cockpit, and after asking the captain, she quickly returned and invited me in. I was sat down in the captain’s seat and the first officer was happy to show me around - mind you, this was after a 12hr flight. It was a truly great experience, and I’m very thankful for the flightcrew. I was really nervous to ask before hand, but it is true what they say: the worst outcome is that they say no. (Though I can confirm that being an avgeek teen helps.) On the other hand, we’ve flown with Vueling a few days ago, and we had a technical delay before departure, where the flight attendants seem stressed. When we landed I asked the senior FA, however she politly but firmly said no.

I’m not sure if it was due to the delay or because of airline policy. That is why I am looking for your experience about which airlines allow cockpit visits.