I just accidentally deleted my best game by starting a fresh Ironman Mode. It looks like you can only have one Ironman game at a time, but there is no warning to the user that starting a second will erase other games. Please allow for multiples or add a warning! Losing games is traumatic!
If you begin new IronMan game with the same old name of your company, then your old game will be erased.
That happens because the game creates a savefile named by the name of your company and overwrites it as you play.
You can have as many IronMan campaigns as you want, just name all your different companies differently..