Nice idea, but let's think about this logically:
Research:
Someone, or a whole team of people, must find out what airports existed in the era you've specified.
Someone, or a whole team of people, must find out what aircraft existed in the era you've specified.
Someone, or a whole team of people, must find out what buildings, ground vehicles, and sea vehicles existed in the era you've specified.
Someone, or a whole team of people, must find out what airlines (if any) existed in the era you've specified.
Developement:
Someone, (you know the rest), must remove all airports that didn't exist in the era you've specified, and replace their areas with something random, like a flat patch of land, or a huge rainforest, etc.
Must create, or gather, all aircraft which existed in the era you've specified.
Must replace all buildings, autogen, ground vehicles, sea vehicles, and ALL urban textures used in FSX.
Must generate AI flight plans for all airlines (if any) that existed.
Nice idea, but still, the above says it all...
