I'll restate some of the obvious:
Ideas are the easy part. They are literally a dime-a-dozen.
Puttin 'em on screen takes a *lot* of work.
If you can find a good team that works well together, it can be done.
Average developement cost for a game is a cool million per year of developement. Historical flight sims demand a *lot* of research and can drive that average cost quite a bit higher. (try renting 'Crazy Horse' to verify the 'look and feel' you are after, f'rinstance)
Good luck, hope you do well, and no, I am not available.
-GE