Well it appears that perhaps this game is really in development! I found a post over at SimHQ by AVCG_Bilbo:
"The CEO Mark Vange sent all subscribers a message and this was part of it:
In addition to Fighter Ace, we also have a WW1 combat flight simulator. We
will make it available for testing as soon as we can get it up and running
and we think it is stable. We'll keep you updated as to our progress on
Still not sure what to make of this - maybe the project was originally slated for the year 2000, or maybe I'm reading the company's products page wrong?? Anyhow, don't rule it out yet!