On my trip to Israel in Dec, I flew 5 flights on 4 airlines.
SQ as I was allowed in the cockpit for a brief moment the captain didn't allow me to take any pics.
LH/OS allowed me.
US TLV-PHL I entered the cockpit (without asking a FA), the crew were very nice, took pictures, spoke about the plane systems/control (as I had piloted once an aircraft), the captain did the pre-startup checklist with me etc.
The part gets funny as I was in 1H, and couldn't fall asleep as the light in the front was turned on. I asked the FA to turn it off, she said that the flight is "a high security", the captain wants it on during the flight. I asked her why is it on high security, is it because (it was X-mas night) on this night was the "underwear bomb"? She said no, this captain is always on high-security....
So even the captain is on high-s, he still allowed me in, sat there 20min, took pictures.....