It was great inviting pax onto the flightdeck in an era when it was allowed and even encouraged.
I remember chatting to an American in the cockpit of a DC10 about 8 hours out of LAX and he asked "how would you like to be in the cockpit of an L1011 right now?
I replied "not alot". When he enquired why, I said that an L1011 would have run out of fuel about an hour ago (1975 pre-500's). He looked a bit miffed and returned to the 1st class cabin leaving his card with us..... The CEO of Lockheed..........priceless!