Casey,
Flight Plans or Traffic files?
For Flight Plans and if you have Window 7 (perhaps XP too), you might try:
C:\\Users\*your ID Name*\AppData\Roaming\Midrosoft\FS9
I'm not on my flight sim computer right now so I can't confirm it as the location of the "Flight Plans" folder for me, but I'm pretty sure that's where they are.
You will need to have your computer configured to show "Hidden Files and Folders" to see the folder.
If it isn't already, just go to the search function on your computer (bottom left corner of the tool bar), click on it and type in "Folder Options." You'll get a window like the one below. You can then select "View" > "Show Hidden Files and Folders."
When I get to my flight sim computer later today, I'll confirm my suspicions and see if the above is correct.