Planefinder.net is very useful in that it has archives going back several years. I recently wrote a converter that lets you extract the track of a plane and view it in Google Earth with the correct timestamps and altitudes – similar to FlightAware’s downloads.
To do this you need to extract the “payload” for the track. This is what PF sends to your web browser when it displays the track in the map. It requires a little trickery.
Then click on the plane you want ... Read even more