SSD's are not essential. They are optional. For games, money put towards a better video card would be a better investment.
For Aces High III, there is virtually no benefit to using an SSD, unless your system is overloaded with background processes which are constantly hitting the storage device.
It is the expensive, lazy way to correct performance issues which can be alleviated with a little time invested in eliminating the causes of performance issues.
The only time an SSD is beneficial, in a properly configured system, is the first time something needs to be loaded, after a fresh power up.
Example:
The first time I load Aces High III. on my very slow 2.33Ghz E6550 Intel dual core system with 4GB of system RAM running Windows 7 Pro 64 bit takes 13 seconds to get to the main menu.
The second time I load it, it only takes 4 seconds.
After either load, there is little, to no benefit of having an SSD in a properly configured system. The only time saved will be the first load. The second load does not hit the storage device enough to make any difference.
Now, after logging into the game and selecting an arena.
The first time takes 11 seconds to get to the tower. The second time takes 7 seconds to get to the tower. Again, the only time you will save will be the first time as the second load is taking it from the Windows cache, which will reside in memory if there is room.
Note that my minimum 4GB system RAM still had the game loaded in the Windows memory cache, but my systems are properly configured and that makes all the difference. Nothing magical about it. Anyone can do it. It just takes some time.