Sorry if this is a tired old subject - I'm a big-jet jockey and never dabbled in CFS. Until now maybe...
I was watching a (UK) documentary this week in which a bunch of RAF graduates fresh from fligiht school were thrown into a Lancaster Simulator and asked to replicate the Dambuster mission of WW2. The idea was to see just how difficult the low flying, the nav and the bomb aiming was compared to todays computerised planes. The producers used MS flight sim (I'm guessing from the flack graphics it was CFS3) but I'm wondering if the German dams, the Lancaster and enroute scenery were add-ons or actually part of the flight sim?