Took me a couple minutes with
ADEI removed all the clutter, but if there's more you'd like to remove or something you'd like to add, follow the ADE link to their site and download ADE9X. After installation open the program and choose "Open Stock Airport". Then choose KOSH from the menu. The airport will appear as it does in FSX. You can then choose to remove or keep whatever you'd like. After you edit the airport to your liking save it and then compile a bgl.(both tasks can be done from the "File" drop down menu). Compile the bgl. to your desktop or somewhere easy to access. Then you'll need to create a new folder on your desktop....name it "OshKosh_NoCrowds". Then create a new folder inside the folder you just created and name it "Scenery". Now place your compiled bgl. file in the "Scenery" folder you just created. Now all you have to do is add the "OshKosh_NoCrowds" folder to your FSX scenery cache
Or you could just download the one I just did for now......and if you need any help with ADE just ask
http://www.2shared.com/file/L_yl0TJC/KOSH_NoCrowds.html If anyone else would like this file I'll upload it to the SimV main site also