I have used AirNav systems in the past...its a very good flight tracking program, a little expensive, but it is well worth it. It shows nearly all IFR traffic even those that are Blocked (it just blocks out the tail number with the letters BLOCKED, but still gives all the other information). I think for the cost AirNav is well worth it, with its mulitple filters, and search features. You can search for a/c types, destination, departure point, callsigns, or any combination of those.
