I see this is dead now. Shame - but I think it does seem to have lost a lot of players, not to mention stopped development.
I haven't flown it for about a year or more - saving it for something different, but I just hope it will remain available now, considering it has to connect online for everything to work.
I think I got the last campaign files before the site was closed.
Well, not quite dead yet. Official development has pretty much been non-existent for some time now, but there is an excellent 3rd party campaign mod called Pat Wilsons Campaign Generator that is still being updated. You may wish to try it. You can find it here:
PWCG Unified Beta If you are looking for deep WWI single player campaign action, you may wish to visit Wings Over Flanders Fields. It is still in development (the devs are working on a WOFF UE - Ultimate Edition) and has an active community.
WOFF 3 (current iteration) Screenshots / Videos Thread
WOFF 3 Screenshots & Videos