It's not only Flight "Crew" in there DVP, but a broad spectrum from all walks of life and aviation... busiest time is evening UK time, though there is an Ozmate high around 5 to 8 gmt, I think.
Give it a go, but always remember the Sick Squids Golden Rule of Aviation... you never know who you are talking to! Meaning, the humblest junior FO on your flight could be a bonafide Rocket Scientist in a previous life, your Purser could be a qualified Doctor or a PhD, or your skipper could have represented your country in the Olympics.
Anyway, this site does attract a few pilots, and some of them do head for chat. Please stop them talking about flying, it doesn't do them any good!
All the best,
£6