If you file your flight plan with www.fltplan.com they will give you your assigned routing and they also have options to select the routes that have been recently given by ATC so you can see what to reasonably expect. When you file your flight plan, you have to wait about 10 minutes or so for it to go through the ATC process and then your flight plan routing will show up. At that time you can receive a text message will have your routing on it.