I stumbled across this quote from an insider. Not sure how trustworthy it really is, but it claims to come from an ex-Aces member and kind of confirms what people in the past have hinted, especially the first person mode that people at ESP were working on. Interesting stuff:
Planned features included voice recognition with air traffic control, first-person mode, a full fledged career mode with a job board and a currency system, a lighter-then-air aircraft class, and skydiving. "We were starting to focus more on the game aspect of it than just the simulation," the ACES insider told us.
