Wade, I think I did what you want to do this past weekend. Here is the path:
Menu -> Settings -> Map Settings -> Past Flights
You will find them sorted by date and time. If you have done any simulated flying you will see them there as well. From there you choose the date and time of the flight and follow the prompts to load it and it will show on your map.
To remove it, you need to go back into the Past Flights dialogue box and choose the option to clear the flights.
I hope that is what you are looking for. I am looking for the way to overlay them on to Google Earth.
TM