AirNav FS Live Traffic X downloads in real-time from the internet the flight position and status for more than 10 thousand flights and adds them to Flight Simulator X. You will end up flying with real traffic in real conditions in real-time!
Every cancelled flight, every delay, every extra flight will show up, live instead of records. Sounds complicated? Not at all! You just start a small program that fetches the necessary data from AirNav Systems servers (connected to the FAA radar system) and starts a converter that creates a traffic scenery file - once this is done you start Microsoft Flight Simulator. No longer you waste your time with optimizing traffic - you are live.