Edit: clarification as to stand-alone vs GB add-on. From the developer:
IL-2 Sturmovik: Flying Circus - Volume I is part of the IL-2 Great Battles series of products and can be played as a separate stand-alone product or be integrated with other Great Battles titles such as Battle of Stalingrad, Battle of Moscow, Battle of Kuban and Battle of Bodenplatte. Combine all titles to create one big WWI and WWII air and ground combat simulation.
Since it is viewed as somewhat a niche branch within a niche product, the original release (FC Vol 1) is limited to the Arras map, a WW1 plane set, and quick mission builder. There are no missions, scripted campaigns, or careers delivered by the developer. It basically being thrown out there to the sim community wall to see what sticks. FC is somewhat based on Rise of Flight, but with the new terrain engine and other improvements. There has been some criticism that it is not being given the same love as the rest of BoX GB, but the developer has been open about this. A vote with your wallet sort of thing.
For a WW1 novice like myself, it all looks, sounds, and feels amazing. The main criticism on the Arras map is the low res rendering of no man’s land and for those familiar with the Arras plain, the lack of some of the notable landmarks. However, others have said that more known landmarks have been recreated in great detail. I wouldn’t know. Flying in what feels like a string and fabric kite, wagging along behind a chugging tractor engine and swinging wooden propeller, I’m so smitten by the experience, that I’ve not had much time to think about the war in the trenches. And that’s not to mention the threat of having said machine eviscerated by a more experienced foe at any second.
For missions and campaigns, a gentleman named Patrick Wilson has come to the rescue and developed an amazing campaign generator, initially for the WW2 era maps and aircraft, now a dedicated version for Flying Circus. For better or worse, it is a Java based application that drops easily into your base IL2 BoS install folder. Add some minor tweaks and you are on your way. It also generates co-op missions! Did I mention that it is free?
Dedicated Flying Circus Forum
Giant unofficial FC skin pack. Some amazing work here. Examples.
Pat Wilson’s Campaign Generator
PWCG FC announcements
PWCG tutorial on YouTube