To add to the above,
Most of the DangerDogz flying is still in il2 HSFX6, with flying nights being tue, thur, sat and sunday at around 7-8pm zulu time and runs normally for 2-3 hours or until the host decides he needs to go to bed, plus on wed nights american specific flight time nights (us in europe tend to be tucked up in bed by then, although not always!) That said, there is also just general flying that goes on, rule of thumb, look and see if someones on TS (can see the TS list on the forums), and join, there'll soon point you to where the action is!
Because we fly co-ops, you do not have to be in at the start, just turn up when you can fly, within that time frame.
Rise of flight is the other main sim that people fly, although there are many members that dabble in DCS, CLOD just to name a few, and nights are sometimes organised ad hoc for these as well.
Here is a thread that will tell you more about BG, and the respect people have for his memory,
http://dangerdogz.com/forums/topic/8881-salute-to-bg/
regards fb.